题目内容
Newton was sitting under an apple tree ______ an apple fell onto his head.
| A.when | B.while | C.after | D.before |
A
本题考查连词辨析。此处when作并列连词,表示“就在此刻(and justthen)”“,突然(and suddenly)”。
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| A.when | B.while | C.after | D.before |