is known to us all, the moon travels around the earth once every month. [ ] A．It
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________ is known to us all, the moon travels around the earth once every month.
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A．ItB．AsC．ThatD．What试题答案
答案：B
________ is known to us all, the moon travels around the earth once every month.
[]
A．ItB．AsC．ThatD．What答案：B