题目内容
6．He was last seen _________in his office at about 7：15p．m..（ ）| A． | work | B． | working | C． | to work | D． | worked |
分析 最后看见他的时候是在下午7点15分，他在办公室工作．
解答 答案：B．
根据He was last seen _________in his office at about 7：15p．m．大约在下午7：15．他是最后被看见在办公室工作的．see sb doing sth看见某人做某事，其被动形式为sb be seen doing sth．故选B
点评 结合题干，找出词眼see sb doing sth．再根据语境应用它的被动结构be seen doing sth．，把其用法记牢，在应用时就能作出准确的判断，选出正确的选项．
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