单项选择题

Now the air pollution in this city ______ more and more serious with each passing day.

A．to become
B．became
C．becoming
D．is becoming
<上一题 目录 下一题>
热门 试题

单项选择题
The manager said that there were two reasons ______ our sales dropped sharply last year.
A．because
B．since
C．why
D．while
单项选择题
Few companies are interested in providing the software we need ______ the market is small.
A．although
B．since
C．so that
D．as if
相关试题