单项选择题

His motive for working so hard is that he needs money.

A. motivation
B. active
C. motion
D. nature
<上一题 目录 下一题>
热门 试题

单项选择题
Those countries were once worried that they would not have adequate supplies of petroleum.
A. effective
B. efficient
C. potential
D. sufficient
单项选择题
It remains a puzzle about why our outermost planet exists.
A. problem
B. mystery
C. question
D. point
相关试题