About 60 million years ago Gondwana broke up into 27 later became South America, Africa, Antarctica, India and Australia.
答案：(C) what
what 是複合關係代名詞，本身就等於「先行詞 + 關係代名詞」（＝the things which），介系詞 into 後面沒有先行詞，只能用 what；which、that 前面必須有先行詞，where 引導地方副詞子句，都不合。
介系詞 + what + 動詞。看到空格後面接著動詞 later became，你判斷要填關係代名詞——這一步沒錯，錯在下一步：伸手就拿 which 或 that。課本上的關係代名詞永遠長成「先行詞 + 關代」，眼睛已經習慣往左邊找名詞。這一格的關鍵就在：往左找，找不到。空格左邊只有介系詞 into，再往前是動詞 broke up 和主詞 Gondwana，沒有名詞可以當先行詞。
關係代名詞的解題法只有一步：把先行詞代進關代子句，唸得通就對。先試 which：先行詞是哪一個字？找不到，代不進去，which 和 that 這裡都不能用。what ＝ the thing(s) that／which，先行詞跟關代包在一起，所以它前面本來就不會有先行詞——這是 what 最好認的地方。代進去看看：broke up into what later became South America… ＝ broke up into the landmasses that later became South America…（分裂成後來變成南美洲…的那幾塊陸地），唸得通，答案就是它。這個字你國中用過：What he said is true.（他說的話是真的）＝ The thing that he said is true. 一句記完：What used to be a parking lot is now the park where the whole neighborhood jogs.（原本是停車場的那塊地，如今成了整個社區慢跑的公園。）〔情境取材自 111 學測作文題：兩座公園的比較〕
which 與 that 前面都要有先行詞，這裡沒有；that 還多一條限制，不能直接接在介系詞後面（英文不說 into that）。where 後面要接完整子句，本句 where 之後直接是動詞 later became，缺主詞。
what（＝the thing(s) that／which，複合關係代名詞）、Do what you like.（做你喜歡的事）、what is called（所謂的）、what is more（更有甚者）、what is worse（更糟的是）、break up into（分裂成）。其中 what is more 這一組考過 3 個年度，103 年第 19 題 →、115 年第 11 題 →都出現過。
Up to about 250 million years ago the world had just one huge super-continent called Pangaea. Animals were able to move and intermix with 26. About 200 million years ago this super-continent broke up into two continents: Laurasia and Gondwana. About 60 million years ago Gondwana broke up into 27 later became South America, Africa, Antarctica, India and Australia.
Since then Australia 28 from the rest of the world by vast oceans. The animals there no longer had 29 with animals from other parts of the world. They evolved separately. As a result, about 95 % of Australia's mammals and 94 % of its frogs are found 30 else in the world. Australia has lots of very unusual animals.