题目内容
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
【答案】
A
【解析】unless 除非，如果不； if是否，如果；since由于，自从……以来；whether是否。句意：学习写作就是学习思考。如果你不能把它们写下来，你就不能了解事物。结合语境可知选A。
考点：连词辨析
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