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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

B


解析:

 此題很容易誤選A,認為此處應填一個形式主語,況且It is (well) known

to ...也是一個常用句型,讀起來也很上口,但是選A錯了。同學們仔細想想看,假若選A,橫線處填一個形式主語(it),那么其后就應有一個真正的主語,但事實上沒有。但是若將句中的逗號改成that,則只能選A,因為這樣一來,that便成為一個引導主語從句的引導詞。此題的最佳答案是B,as引導的是一個非限制性定語從句,可置于主句前(常譯為“正如”)或主句后(常譯為“這一點”),句意為“正如大家所知,月球每月繞地球轉一周”。

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