_____ suddenly occurred to me _____ I had to attend an important meeting in Shanghai the next day.
A．It; whichB．What; that
C．What; whichD．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。
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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