He was also the man who cracked the 16 uncrackable Enigma code used by Nazi Germany.
答案：(D) supposedly
supposedly uncrackable（據稱無法破解的）表示恩尼格瑪密碼原本被認為是無法破解的，圖靈卻成功破解了它；eventually／precisely／concernedly 均不符合此處語意。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
supposedly 這個字，你的印象大概只有 be supposed to（應該）那一個組合，很難立刻想到它單獨當副詞時是「據稱、大家都說」。加上這一句講的是圖靈把密碼破解了，uncrackable（無法破解的）看起來與事實矛盾，很容易覺得這一格要填「終於」，於是選了 eventually。
四個選項都是 -ly 副詞，擺在形容詞 uncrackable 前面修飾它，文法上都放得進去，可見這一格考的是語意。而句子裡的矛盾正是線索：cracked the ______ uncrackable Enigma code，他破解了一個「無法破解」的密碼。既然事實上破解了，那個「無法破解」就不會是真的，只能是大家原本以為的。supposedly 的意思正是「據稱、一般認為，但未必屬實」，一放進去，矛盾就化解了。把它掛在你熟的 be supposed to 上面記：那個組合也是「別人認為應該如何」，重點都在別人怎麼說，不在事實。順便看構詞：uncrackable 是 un-（不）加 crack（破解）加 -able（可……的），拆開就讀得出來。
eventually（最後、終於）講的是時間先後，但空格修飾的是 uncrackable 這個形容詞，「最後無法破解的密碼」講不通；要表達「終於破解」得把它放到動詞旁邊。precisely（精確地）修飾的是量測或說法（precisely at noon），不能拿來修飾「無法破解」。concernedly（憂心地）描述的是人的情緒，密碼不會憂心。
supposedly（據稱、一般認為）、be supposed to V（應該、被認為該做）、crack a code（破解密碼）、turn the tide（扭轉局勢）、un- ＋ 動詞 ＋ -able（不可……的）、precisely（精確地）
Alan Turing was one of the leading scientific geniuses of the 20th century. Many scholars consider him the father of modern computer science. He was also the man who cracked the 16 uncrackable Enigma code used by Nazi Germany. His code-breaking turned the tide of World War II and helped save two million lives. Nevertheless, 17 people have even heard his name.
Turing displayed signs of high intelligence in math and science at a young age. By the time he was 23, he had already come up with the idea of what 18 the modern computer—the Turing machine. Today, Turing machines are still used in theoretical computation. He also proposed the now famous Turing test, used to determine whether a computer exhibits intelligent behavior equivalent to that of a human.
The postwar era, however, was a disaster for Turing. He was gay, which was then a crime in Britain. 19 being hailed as one of the crucial figures in defeating the Nazis, Turing was convicted of "gross indecency." This 20 drove him to commit suicide in 1954, at the age of 41.
Nearly 60 years after his death, Queen Elizabeth II granted Turing a formal pardon for his conviction, upon an online petition signed by prominent scientists and technology leaders around the world.