【題目】You will fail the exam _____ you study harder than before.

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

【答案】D

【解析】

試題分析：句意：---如果你不比以前更努力學(xué)習(xí)你將考試失敗。本題考查unless 引導(dǎo)的條件狀語從句，遵循主句用一般將來時從句用一般現(xiàn)在時。A. if 如果；B. and 和，又；C. Or要不然；D. unless 除非。結(jié)合語境，故選D。

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