题目内容

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 ?
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。
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