_____ is known to everybody, the moon travels round the earth once every month.
A.ItB.As?C.ThatD.What
B
 此題很容易誤選A,認(rèn)為此處應(yīng)填一個(gè)形式主語,況且It is (well) known
to ...也是一個(gè)常用句型,讀起來也很上口,但是選A錯(cuò)了。同學(xué)們仔細(xì)想想看,假若選A,橫線處填一個(gè)形式主語(it),那么其后就應(yīng)有一個(gè)真正的主語,但事實(shí)上沒有。但是若將句中的逗號(hào)改成that,則只能選A,因?yàn)檫@樣一來,that便成為一個(gè)引導(dǎo)主語從句的引導(dǎo)詞。此題的最佳答案是B,as引導(dǎo)的是一個(gè)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(diǎn)”),句意為“正如大家所知,月球每月繞地球轉(zhuǎn)一周”。
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