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After we went into Mr.Lee office he asked us [ ]

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After we went into Mr.Lee office he asked us [ ]
A,to seat B ,seat C,to be seated D,seating
【写原因】
he asked us to sit .sit是不及物动词.
he asked us to be seated.seat是及物动词,"使..就座",后面必须加宾语,seat us,“使我们坐下”.改为被动语态“we were seated”.现在“us”既做“asked”的宾语,同时又提前成为"seat"的主语,再结合“ask sb to do sth" 结构.
排除法,知道“ask sb to do sth" 结构,就排除B和D.seat是及物动词,"使..就座",后面必须加宾语.但可以改为“ to sit ”,sit是不及物动词,所以排除A.答案为“C”.