问题 选择题

The expert offered us another piece of advice,_____of great help to our program. 

A.I think it is

B.I think which is

C.which I think it is

D.which I think is 

答案

D

I think 为插入语,干扰了定语从句结构的判断,从句中缺少主语,不能省略。故选D。

问答题
单项选择题