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_________ across the railway, a train hit it.
A.While walkingB.Walking slowly
C.As the little pig walkingD.While the little pig was walking
D

試題分析:考查句子結(jié)構(gòu):逗號后面是簡單句,主語是a train,A項用的是狀語從句的省略式,只有主語一致的時候,才能省略從句的主語和be動詞,但是這兩句話的主語不一致,A是錯的,如果用非謂語作狀語的時候,應該非謂語的邏輯主語是a train,而B項walking的邏輯主語是人,所以也不對,C用的是as引導的時間狀語從句,但是句子缺少be動詞,所以選D。句意:當小豬穿越鐵軌的時候,一輛火車撞到它。選D。
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