Jack loves sports. He is often seen __________ basketball on the school playg...

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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B

解析see的用法为see sb.do或者是see sb.doing,该句是被动语态,意思为“他经常被看见在学校操场打篮球”。这里强调的是这一刻人们看见他正在打篮球的这一幕,故选B。
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