单项选择题

Try the experiment yourself （）you will know the reason.

A. so
B. and
C. or
D. unless

<上一题 目录 下一题>
热门 试题

单项选择题
The streets are all day. It（） during the night.

A. can't have rained
B. mustn't have rained
C. couldn't rain
D. shouldn't have rained
单项选择题
Some of them（） here for three days.

A. have arrived
B. have got
C. have reached
D. have been
相关试题