单项选择题

We must______ that the experiment is controlled as rigidly as possible.

A．secure
B．ensure
C．assure
D．issue
<上一题 目录 下一题>
热门 试题

单项选择题
Although he refused to act on my suggestion, he had to admit that______ what I said.
A．it was something in
B．there was something in
C．it was something as for
D．there was something upon
单项选择题
It was a bold idea to build a power station in the deep valley, but it______ as well as we had hoped.
A．came off
B．went off
C．brought out
D．make out
相关试题