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_____ is known to everybody, the moon travels round the earth once every month.

A.It

B.As

C.That

D.What

 

【答案】

B

【解析】考察從句連詞選擇。根據(jù)句子結構可知,該句為非限制性定語從句,從句中缺少is的主語,代指后面的 the moon travels round the earth once every month

 

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