a 宇宙的形成是在过去,所以用过去式.
how …… come into being
……是怎么形成的
scientists have many the ories about how the universe ---into being
scientists have many the ories about how the universe ---into being
a came b was coming chad come d would come
a came b was coming chad come d would come
英语人气：114 ℃时间：2020-03-29 16:23:06
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