单项选择题

A．but
B．even
C．and
D．or
<上一题 目录 下一题>
热门 试题

单项选择题
A．happenedB．occurringC．goingD．taken place
A．happened
B．occurring
C．going
D．taken place
单项选择题
This passage is concerned primarily with the ______.
A．problems of waste disposal
B．dangers of drinking from wells
C．turbidity of polluted water
D．outbreak of cholera
相关试题