Mathild and her husband went from room to room,____,and found the necklace lost

题目

Mathild and her husband went from room to room,____,and found the necklace lost
A checked B checking C to check D check请问选什么?为什么呢?

答案

B,吧横线的成分去掉,你会发现这个句子仍然是完整的,也就是,横线部分做的是状语,而check与主语是主谓关系,所以用ing形式