Jack loves sports. He is often seen______basketball on the school playground.

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问题 Jack loves sports. He is often seen______basketball on the school playground.

选项 A、play
B、playing
C、plays
D、to play

答案D

解析 本题考查感官动词的被动语态。see sb.doing sth.表示看见某人正在做某事,see sb.do sth.看见某人做某事(强调看见过程)。本句的意思是经常看见杰克在学校操场上打篮球,强调他打篮球的过程。see sb.do sth.变成被动语态时,要变成be seen to do sth.。在主动句中,像see,watch,hear,feel,notice,observe等感官动词后面作宾语补足语的动词不定式不带to,但改为被动结构后,要把省略了的to加上。
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