单选题
If I ______ harder for the final exam, I should have passed it.
A、
study
B、
had studied
C、
studied
D、
was studying
【正确答案】
B
【答案解析】
[解析] 句中的陈述与过去事实相反，因此从句用had studied，主句用should+have done 的形式。
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