_____ suddenly occurred to me _____ I had to attend an important meeting in Shanghai the next day.


  1. A.
    It; which
  2. B.
    What; that
  3. C.
    What; which
  4. D.
    It; that
D
試題分析:考察it作為形式主語。本句指的it是形式主語,真正的主語是后面的that引導的主語從句,that在主語從句中不充當任何成分,只起引導和連接作用。本句中還有固定句式It occur to sb that…某人突然想起某事;句意:我突然想起我明天要去上海參加一個重要的會議。故D正確。
考點:考察it形式主語
點評:形式主語,顧名思義,即形式上是主語,但實際上不是真正的主語,真正的主語是后面的動詞不定式、動名詞或主語從句等。如果讓后面的動詞不定式、動名詞或主語從句用作主語,那么在句式上容易造成“頭重腳輕”,句式不平衡,故往往用it作形式主語,而把真正的主語放在后面。it在這里沒有任何意義。
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