_______ was known to them that the boss had broken his promise______ he would give them a rise.
A.What; whatB.It; whichC.It; thatD.As; that
C

試題分析:這里that引導的主語從句是句子的真正主語,所以需要It作形式主語;在主語從句中,又包含一個同位語從句,引導詞在同位語從句中不作任何成分,且無實際意義,故用that引導。
點評:在英語中,it有許多不同的用法,它既可以用作代詞(如人稱代詞、非人稱代詞),也可以用作引導詞(作形式主語或形式賓語),還可以用來構成強調句型。it作非人稱代詞表示天氣、日期、時間、溫度、距離、價值、路程、度量、自然現(xiàn)象與環(huán)境等。也可模糊地指一般情形或上文的部分或整個意思;這道題目的關鍵在于判斷從句是定語從句還是同位語從句。引導詞that引導定語從句時,在從句中作主語或賓語,作賓語時常常省略;that在同位語從句中僅起連接作用,不充當任何成分,并且不能省略。
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