they spent as many hours as they could _______ their lesson

they spent as many hours as they could _______ their lesson
A.to study B.studying C.studied D.study
选什么的,为什么?
说是表示目的,感觉也有道理,可是觉得B也可以,搞不清楚了……
其他人气:375 ℃时间:2019-12-09 18:55:17
优质解答
选B
spend 后加动名词
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