Maybe if I literature but not science then I would be able to give you more advice now.

问题补充：

Maybe if I literature, but not science then, I would be able to give you more advice now.

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：本题考查虚拟语气。句意为“或许当初我要是学了理科而不是文科，现在就能给你更多的帮助。”then表示过去的时间，if引导的从句是对过去的虚拟，因此使用过去完成时。选C。