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they spent as much time as they could___their lessons A preparing B prepare C to prepare D prepared为什么?

题目详情
they spent as much time as they could___their lessons A preparing B prepare C to prepare D prepared
为什么?
▼优质解答
答案和解析
他们花费了尽可能多的时间在功课上.
spend的过去式 spent
这个题目要考的是spend 的用法,后面接ing形式,as much time as they could是修饰
语句的主干是they spent some time (in)___something.
若表示"花费(时间、金钱等)做某事",则常用句型spend some money / some time (in) doing sth.,此时第二个动词要用动词-ing形式,介词in可以省略.