问题 选择题

Newton was sitting under an apple tree ______ an apple fell onto his head.

A.when

B.while

C.after

D.before

答案

答案: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)”。

问答题 论述题
单项选择题 B型题