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They spent as many hours as they could -----their lessons
为什么是填to study,而不是根据spend sth on sth,spend sth (in) doing sth,填studying为什么不对?
人气：148 ℃ 时间：2019-08-20 22:15:05
解答
to study这里跟词组没关系.动词不定式表示目的.
他们花尽可能多的时间 来学习课程.来学习课程是目的,用to study表示
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