The matter about _____ you argued last night has been settled.A.that B.what C.which D.for whichA.B.D.错在哪

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The matter about _____ you argued last night has been settled.
A.that B.what C.which D.for which
A.B.D.错在哪

看意思
argued about the matter
the matter which you argued about

.that 前有介词,就用which、what 不能跟定语从句、for which ,which 前有介词about了,不再有for 。
明白了吧。

B,C,D才错了