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【题目】— I’m not sure _________ the highway will close soon. Let’s set off earlier.

A. whether B. when C. how D. why

【答案】A

【解析】句意:——我不确定高速公路是否会很快关闭,让我们早些动身吧。A. whether是否; B. when 什么时候;C. how如何;D. why为什么。soon不久,很快,表示时间,因此句子不能再用when来引导,结合句意可知,答案为A。

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