The astronaut did many experiments in the spaceship, great help for

题干

The astronaut did many experiments in the spaceship, great help for knowing more about space.

A．which we think it is	B．which we think is of
C．of which we think is	D．we think which is of

上一题下一题 0.85难度单项选择更新时间:2010-09-03 03:08:06

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