they spent as much time as they could___their lessons A prep

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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?

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.

they spent as much time as they could___their lessons A prep They spent as much time traveling as they_________. they spent as much time travelling as they____ they spent as many hours as they could_____their lessons? They spent as many hours as they could -----their lessons Jack spent as much time as he ___ over lessons. The girl spent as much time as she______ her lessons. He spent as much time as he ____over his lessons. The students spent as much time getting trained as they ____ the students spent as much time getting trained as they had The girl spent as much time as she ________ her Lessons. as much as they want 什么意思