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

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”.

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