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

A．when

B．while

C．a(chǎn)fter

D．before

 

【答案】

A

【解析】本題考查連詞辨析。此處when作并列連詞,表示“就在此刻(and justthen)”“,突然(and suddenly)”。

 

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