【題目】Joan was walking in the street________ she saw the accident.

A.whenB.whileC.afterD.before

【答案】A

【解析】

句意:瓊在街上走的時候看到了事故。

考查連詞辨析。when當(dāng)……的時候,表示某一個動作正在進(jìn)行時另一個動作突然發(fā)生,從句動詞用終止性動詞或延續(xù)性動詞;while當(dāng)……的時候,從句中的動詞必須是延續(xù)性動詞;after在……之后;before在……之前。根據(jù)“she saw the accident.她看到了事故”,see是非延續(xù)性動詞,可知后面三項(xiàng)不合句意語境,故選A。

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