Itwasnotuntilthebeginningofthe

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It was not until the beginning of the twentieth century________to explore space.

A．did man begin	B．when man began
C．that man began	D．then man began

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A．left

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A．beingdonewell	B．hasbeendonewell
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Mr. Green is said _____ an experiment to prove the new method of solving　the problem when young.

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