【題目】Newton was playing under an apple tree _______ an apple fell on his head.
A.until
B.while
C.when
D.after

【答案】C
【解析】句意：當(dāng)牛頓在樹底下玩得時(shí)候，這時(shí)一個(gè)蘋果落到了他的頭上。這里是when引導(dǎo)的時(shí)間狀語(yǔ)從句，這時(shí)的意思；A. until直到；B. while當(dāng)……的時(shí)候；C. when當(dāng)……的時(shí)候；D. after在……之后。根據(jù)題意，故選C。

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