The astronaut did many experiments in the spaceship, ______ much help for knowin

题干

The astronaut did many experiments in the spaceship, ______ much help for knowing space.

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

上一题下一题 0.85难度单项选择更新时间:2013-09-09 05:38:08

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