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Theexpertofferedusanotherpieceofadvice,ofgreathelptoourprogram.A.IthinkitisB.IthinkwhichisC.whichIthinkitisD.whichIthinkis

题目详情
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 
▼优质解答
答案和解析
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。