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

问题描述:

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...