I don't know ______ that kind of materia
题型:选择题
问题:
I don't know ______ that kind of materials. [ ]
A. where to buy
B . what to buy
C. when I
D. why you buy
I don't know ______ that kind of materials. [ ]
A. where to buy
B . what to buy
C. when I
D. why you buy