.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 |
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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.
A.started | B.starting | C.to start | D.to be started |