Another requirement was 18 he should have large ears, upward-slanting eyes and eyebrows.
答案：(D) that
that 引導名詞子句作主詞補語，說明「另一項要求是他應該有大耳朵」；what（不能這樣引導完整的主詞補語子句）、whether（是否，語意不合，這裡不是不確定性而是明確要求）、why（為什麼）都不合。
what 這個字，你的印象大概只有疑問詞「什麼」這一個身分，所以看到 was 後面要接一個子句，就在 what 與 that 之間憑語感二選一，唸起來順就填哪一個。這一格不必靠語感，把子句的成分數一遍就有答案。
四個選項都是能帶出名詞子句的字，可見這一格考的是「這個子句缺不缺成分」。先把空格後面整串讀完：he should have large ears, upward-slanting eyes and eyebrows——主詞是 he，動詞是 should have，受詞是 large ears, upward-slanting eyes and eyebrows，三樣齊全，一個空位都沒有。that 的工作只是把整個子句掛到 was 後面去當主詞補語，它自己不占子句裡的任何位置，所以只有它填得進去。掛鉤用國中就見過的 The problem is that he is too young.（問題是他年紀太小。）：be 動詞後面接一個 that 子句來說明主詞是什麼，本句的 Another requirement was that... 是同一個句型。這一題的鑑別度 41，分開的就是有沒有真的動手數成分，憑語感的人在這裡拿不到分。
what：它自己就是一個名詞，進到子句裡一定要占一個位置，而這個子句三個位置都滿了，它站不進去。whether：意思是「是否」，用在兩種可能性還沒有定案的時候（I don’t know whether he will come. 我不知道他會不會來。），這裡卻是一條講明白的條件，不是懸而未決的選擇。why：意思是「為什麼」，填進去會變成「另一項要求是為什麼他該有大耳朵」，語意接不起來。
what 進到名詞子句裡有兩種身分，都不是疑問詞「什麼」那麼單純。第一種是複合關係代名詞，意思等於 the thing(s) that，劍橋 English Grammar Today 的 what 條目舉的例句是 What we need to do is make a list of useful phone numbers.（我們該做的事，是列一張常用電話號碼的清單。）。第二種才是間接問句的疑問詞，像 I don’t know what he wants.（我不知道他想要什麼。）。分辨方法：換成 the thing that 讀得通就是第一種，非得換成「什麼」才通順就是第二種。兩種身分有一個共同點，也就是這一格真正的判準——what 一定要在子句裡占一個位置（當主詞、受詞，或介系詞的受詞），因為它自己就是那個名詞。劍橋還講明另一件事：what 不能當一般的關係代名詞，前面若已經有名詞先行詞就得改用 which 或 that（This is the book which the lecturer mentioned. 這是那位講者提到的那本書；不能寫成 the book what...），所以空格前面只要站著一個名詞，what 也先出局。題庫裡有一組題可以擺在一起看：95 年第 24 題 but ___ they are willing to do for others，do 後面缺受詞，填 what；100 年第 29 題 the scarcity of goods is ___ causes humans to attribute value，causes 前面缺主詞，填 what；107 年第 26 題 ___ they are dreaming of，of 後面缺受詞，也填 what。本題的子句一個洞都沒有，這才是它非 that 不可的理由。
meet a requirement（符合要求）、the requirement that…（……的這項要求）、The point is that…（重點在於……）、The reason is that…（原因在於……）、The problem is that…（問題在於……）、What matters is that…（重要的是……）。
Whenever a Dalai Lama died, a search began for his reincarnation. The 16 male child had to have certain qualities. 17 was the ability to identify the belongings of his predecessor, or rather his previous self. Another requirement was 18 he should have large ears, upward-slanting eyes and eyebrows. Besides, one of his hands should bear a mark like a conch-shell. The successful candidate, usually 19 two or three, was then removed from his family to Lhasa to begin spiritual training for his future role. The Panchen Lamas were chosen in a similar way.
The reincarnated leaders were always "discovered" in the households of lowly families 20 noble ones. This was to ensure that no single and powerful noble family could seize the title and pass it to the next generation.