Learning to write is learning to think. You don’t know things clearly _________ you can write
them down.
A．unlessB．ifC．sinceD．whether
A

試題分析：句意：學(xué)習(xí)寫作就是學(xué)習(xí)思考。你不能清楚地知道事情除非你可以把他們寫下來。Unless除非；if如果； since從；whether是否。所以選A。
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