the boy didn't know_____ .a.which chair to sit on b.which chair to sit选 A对吧.CHAIR做宾语,所以加ON
人气：123 ℃ 时间：2020-04-21 22:07:05
解答
A sit 是不及物动词,所以后面还要加 on
如果动词是seat,就应该选B了
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