in recent years ,the economic development of the world has b

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/26 22:35:16

in recent years ,the economic development of the world has been
In recent years,the economic development of the world has been unbalanced,with Americans ____ more
than they earn.A.spending B.to spend C.spent D.spend
为什么不选b
还有为什么than后面的earn可以用原形?

with的复合结构,后面的spend与Americans之间是主动的关系,是已经进行着,并仍在持续的动作；如果用动词不定式的话,就给人一种还没做或将要去做的感觉.至于后面的earn之所以用原型是因为句中对他并没有时态方面的提示,就用一般现在时就可以了.
:)不知道你明不明白,最好再找老师问一下吧

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