摘要： is known to everybody, the moon travels around the earth once every month. A. It B. What C. That D. As
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_____ is known to everybody, the moon travels around the earth once every month.
A. Which B. As C. That D. It
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_____is known to everybody, the moon travels around the earth once every month.
A. It B. As C. That D. What
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________ is known to everybody, the moon travels around the earth once every month．
[ ]
A．It
B．As
C．That
D．what