The visiting professor gave us some advice,________ of great help to our English

题干

The visiting professor gave us some advice,________ of great help to our English learning.

A．I think it is

B．I think which is

C．which I think is

D．which I think it is

上一题下一题 0.85难度单项选择更新时间:2010-06-15 03:32:57

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