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20、The universe began with the Big Bang 13.7 billion years ago, with everything___ in space smaller than a grain of sand.

A.started                                                B.starting

C.to start                                    D.to be started

20、B

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The universe began with the Big Bang 13.7 billion years ago, with everything___ in space smaller than a grain of sand.

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C.to start                                    D.to be started

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