The expert offered us another piece of advice of great help to our program. A. I think

问题补充：

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

答案：

A. I think it is

B. I think which is

C. which I think it is

(答案→)D. which I think is

解析：句意为:--专家给我们提出了另一条建议，这条建议我认为对我们的项目很有帮助。

定语从句中缺主语，可以排除A，C。插入语I think，紧跟在特殊疑问词后，且无时态和语态的变化，可排除B. 故D选项正确

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