动词填空 What____(happen)to the twins this morning?They looked so sad.
问题描述：
动词填空 What____(happen)to the twins this morning?They looked so sad.
答
由后面的lookded得知体现一般过去时,故填：happened可是They looked so sad说明过去的事对现在有影响 不是应该用现在完成时吗