Economics, several courses of which I have taken thus f

首页搜题

搜索

单项选择题

Economics, several courses of which I have taken thus far,（）to be difficult but useful for almost all students。

A.prove
B.havebeenproved
C.proves
D.areproved

试题标题

欢迎来到赞题库！

微信快捷登录/注册