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Learning to write is learning to think. You don’t know things clearly _________ you can write
them down.

A.unless B.if C.since D.whether

A

解析试题分析:句意:学习写作就是学习思考。你不能清楚地知道事情除非你可以把他们写下来。Unless除非;if如果; since从;whether是否。所以选A。
考点:考查连词。

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