_________ 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(xiàng)用的是狀語從句的省略式，只有主語一致的時(shí)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(cuò)的，如果用非謂語作狀語的時(shí)候，應(yīng)該非謂語的邏輯主語是a train，而B項(xiàng)walking的邏輯主語是人，所以也不對，C用的是as引導(dǎo)的時(shí)間狀語從句，但是句子缺少be動詞，所以選D。句意：當(dāng)小豬穿越鐵軌的時(shí)候，一輛火車撞到它。選D。
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