Maybe if I science and not literature then I would be able to give you more help.(·北

问题补充：

Maybe if I science，and not literature then，I would be able to give you more help.(·北京)

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：考查错综时间的虚拟语气。主句用的是would be able to...表示对现在情况的假设，但由if从句中的then可知，从句表示对过去情况的虚拟，故用had studied。