The expert offered us another piece of advice , ___ of great help to our program.
A．I think it isB．I think which isC．which I think it isD．which I think is
D

試題分析：句意為:--專家給我們提出了另一條建議，這條建議我認為對我們的項目很有幫助。
定語從句中缺主語，可以排除A，C。插入語I think，緊跟在特殊疑問詞后，且無時態(tài)和語態(tài)的變化，可排除B. 故D選項正確
點評：定語從句的考查關鍵在于分析句子成分，如果句子缺少主語，賓語，表語或者定語就使用關系代詞；如果句子很完整就使用關系副詞。
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