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    【题目】Learning to write is learning to think. You don't know things clearly ______ you can write them down.

    A.unlessB.if

    C.sinceD.whether

    【答案】A

    【解析】

    句意：学习写作就是学习思考。除非你能把事情写下来，否则你不会清楚地知道。

    考查连词辨析。unless除非，相当于if not，表条件；if如果，表条件；since自从，表时间；whether是否，表疑问。本句是条件状语从句，根据“You don't know things clearly你不会清楚地知道”，可知unless符合句意，故选A。

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