The problem _______ you argued about yesterday has been solved.

问题描述:

The problem _______ you argued about yesterday has been solved.
A.that B.what C.why D.for which
为什么选A,不选D?

这里关系代词做宾语,可用that或which或不填(省略),或about which you argued yesterday… D错在:把定语从句还原成简单句you argued about for the problem… argue about是及物动词短语,若用D,导致该及...