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
解析:
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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