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 為插入語，干擾了定語從句結(jié)構(gòu)的判斷，從句中缺少主語，不能省略。故選D。
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