【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(shí)候看到了事故。

考查連詞辨析。when當(dāng)……的時(shí)候，表示某一個(gè)動(dòng)作正在進(jìn)行時(shí)另一個(gè)動(dòng)作突然發(fā)生，從句動(dòng)詞用終止性動(dòng)詞或延續(xù)性動(dòng)詞；while當(dāng)……的時(shí)候，從句中的動(dòng)詞必須是延續(xù)性動(dòng)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(dòng)詞，可知后面三項(xiàng)不合句意語(yǔ)境，故選A。

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