单项选择题

It is essential that these application forms ______ back as early as possible.

A．must be sent
B．will be sent
C．are sent
D．be sent
<上一题 目录 下一题>
热门 试题

单项选择题
It is one thing to locate oil, but it is quite another to ______ and transport it to the industrial centers.
A．permeate
B．extract
C．distinguish
D．concentrate
单项选择题
______ she realized it was too late to go home.
A．No sooner it grew dark than
B．Hardly did it grow dark that
C．Scarcely had it grown dark titan
D．It was not until dark that
相关试题