单项选择题

A number of theories have been proposed to explain the situation.

A. tested
B. suggested
C. used
D. announced
<上一题 目录 下一题>
热门 试题

单项选择题
We explored the possibility of expansion at the conference.
A. investigated
B. offered
C. included
D. accepted
单项选择题
My doctor said I should vary my diet more.
A. prepare
B. cook
C. change
D. choose
相关试题