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