where ______the recorder?i can not see it anywhere
i_______it right here.but now it is gone
A)did you put,have put
B)have you put,put
C)had you put,was putting
D)were you putting,have put
说明选择的原因,为什么不能选A
2)a quarrel______between the two boys
a)broke out
B)was broken out
C)is breaking out
D)is broken out
请说明选择的原因,为什么不能选B和D