【題目】Learning to write is learning to think. You will know things more clearly _____ you

write them down.

A. or B. unless C. if D. whether

【答案】C

【解析】句意：學(xué)習(xí)寫(xiě)作就是學(xué)會(huì)思考。如果你把它們寫(xiě)下來(lái)會(huì)知道得更清楚。A. or或者，否則；B. unless除非，如果不；C. if 如果；D. whether是否。結(jié)合句意可知，此句是if引導(dǎo)的條件狀語(yǔ)從句，故答案為C。

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