问题补充：
Maybe if I sicence, and not literature then, I would be able to give you more help.
A. studied
B. would study
C. had studied
D. was studying
答案：
A. studied
B. would study
(答案→)C. had studied
D. was studying
解析：考察虚拟语气，if引导的从句是对过去的虚拟，因此使用过去完成时。
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