【題目】You can't get good grades _____ you study harder than before.
A.if
B.unless
C.when
D.So

【答案】B
【解析】句意:如果你不更努力學習,你就不能獲得好成績。when 當……時候;引導(dǎo)時間狀語從句。C. unless 除非,如果……不,引導(dǎo)條件狀語從句; if 如果,引導(dǎo)條件狀語從句,so表示因此。根據(jù)題意。故選B。

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