The missing boy was last seen ________ near the river.

A. playing
B. to be playing
C. play
D. to play

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第1个回答 2013-12-24

答案A
【巧解导析】在主动语态中感官动词后常接复合宾语，具体为“主+v.+O+v. /v.-ing”，变为被动语态后为“主+be+P.P.+v.-ing/to”，由此 B，C不合要求，另外由副词last可知此题强调动作的进行故不选D．

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