问题
选择题
Maybe if I ________ science，and not literature then，I would be able to give you more help.(2011·北京)
A．studied
B．would study
C．had studied
D．was studying
答案
答案：C
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。