________ gravity holds things together, some unknown ________ is working across

题干

________ gravity holds things together, some unknown ________ is working across the universe to pull everything apart.

A．While; force	B．When; power
C．As; energy	D．Since; strength

上一题下一题 0.85难度单项选择更新时间:2018-11-12 11:53:52

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