单选题:According to Lemaitre, the separate galaxies formed _______。

题目内容:
According to Lemaitre, the separate galaxies formed _______。 A.during a pause in the expansion of the universe
B.at the time of the primeval explosion
C.and will continue to form for ever
D.when all the matter in the universe was all concentrated in one small mass
参考答案:
答案解析:

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