this is the question ______ that we've had so much discussio

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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

discuss是个及物动词,后面不需要介词
再问：可是答案是we've had so much discussion about 有点困惑
再答： discussion是discuss的名词形式，用了discussion，就要用介词了
再问：哦！我懂了谢谢^ ^

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