单项选择题

America will never again have as a nation tee spirit of adventure as it
______ before the West was settled.

A．has
B．did
C．was
D．would
<上一题 目录 下一题>
热门 试题

单项选择题
His father is a ______ professor in a prestigious university.
A．respectful
B．respectable
C．respecting
D．respective
单项选择题
We must ______ that the experiment is controlled as rigidly as possible.
A．secure
B．ensure
C．assure
D．issue
相关试题