【选择题1道】进行时与完成时的.
问题描述：
【选择题1道】进行时与完成时的.
mary is taking notes of the grammatical rules in class at XX school,where she ____ English for a year.
A studies
B studied
C is studying
D has been studying
我想选B或者A
=.
答
for引导的时间状语用完成时