问题 选择题

__ was once regarded as impossible has come true.

A.Who

B.Which

C.That

D.What

答案

答案:D

that是连词,只起连接从句作用,不做句子成分;what是关系代词,相当于something that或anything that,that中不含 what ,但what中有that。

单项选择题
单项选择题 A1/A2型题