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_____ is known to everybody, the moon travels round the earth once every month.
A.ItB.As?C.ThatD.What
B
 此题很容易误选A,认为此处应填一个形式主语,况且It is (well) known
to ...也是一个常用句型,读起来也很上口,但是选A错了。同学们仔细想想看,假若选A,横线处填一个形式主语(it),那么其后就应有一个真正的主语,但事实上没有。但是若将句中的逗号改成that,则只能选A,因为这样一来,that便成为一个引导主语从句的引导词。此题的最佳答案是B,as引导的是一个非限制性定语从句,可置于主句前(常译为“正如”)或主句后(常译为“这一点”),句意为“正如大家所知,月球每月绕地球转一周”。
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