The visiting professor offered us some advice, of great help to our Engli

题干

The visiting professor offered 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 0.64难度单项选择更新时间:2015-04-03 06:20:23

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