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_________ it takes many years to gain the skills of an expert.

A.It is well known to us thatB.As is known to us that
C.As we know thatD.That is well known to us

A

解析試題分析: 考查主語從句:句意:要花費很多時間才能獲得專家的技能這是眾所周知的。這里it是形式主語,that引導(dǎo)的是真正的主語從句,如果是B和C項,應(yīng)該是把that改成逗號,變成非限制性定語從句,D項錯在that不能走形式主語。選A。
考點:考查主語從句

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