问题描述:
We( )the problem for quite some time,but we( )any conclusion yet.
A.have been discussing.haven't reached
B.have disscussed.haven't been reaching
C.discussed.haven't reached
D.had discussed.haven't reached
A.have been discussing.haven't reached
B.have disscussed.haven't been reaching
C.discussed.haven't reached
D.had discussed.haven't reached
问题解答:
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