Jane _____ these families of chimps for
题型:选择题
问题:
Jane _____ these families of chimps for many years and helped people understand how much they behave like humans.
A.had studied
B.studied
C.studies
D.has studied
Jane _____ these families of chimps for many years and helped people understand how much they behave like humans.
A.had studied
B.studied
C.studies
D.has studied