this is the question ______ that we've had so much discussion4.This is the question __.A.that we've had so much discussion B.we've discussed about C.we've had so much discussion about D.of which we've discussed

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this is the question ______ that we've had so much discussion4.This is the question __.A.that we've had so much discussion B.we've discussed about C.we've had so much discussion about D.of which we've discussed

this is the question ______ that we've had so much discussion4.This is the question __.A.that we've had so much discussion B.we've discussed about C.we've had so much discussion about D.of which we've discussed
this is the question ______ that we've had so much discussion
4.This is the question __.
A.that we've had so much discussion
B.we've discussed about
C.we've had so much discussion about
D.of which we've discussed

this is the question ______ that we've had so much discussion4.This is the question __.A.that we've had so much discussion B.we've discussed about C.we've had so much discussion about D.of which we've discussed
discuss是个及物动词,后面不需要介词