【題目】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：學(xué)習(xí)寫作就是學(xué)習(xí)思考。除非你能把事情寫下來，否則你不會清楚地知道。

考查連詞辨析。unless除非，相當(dāng)于if not，表條件；if如果，表條件；since自從，表時間；whether是否，表疑問。本句是條件狀語從句，根據(jù)“You don't know things clearly你不會清楚地知道”，可知unless符合句意，故選A。

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