GMAT
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In some cases, two clouds may break apart from the collapsing matter that typically forms a star, then holding each other in orbit around their common center of mass as a binary star.
star, then holding each other in orbit
star, and then holding each other in orbit
star and then hold each other in orbit
star and then hold each other, they orbit
star and then orbit, holding each other
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题目来源1:Ready4