单项选择题

Electronics ______ quickly in recent years.

A. developed
B. developing
C. has developed
D. have developed
<上一题 目录 下一题>
热门 试题

单项选择题
The United Nations ______ formed in 1945.
A. was
B. were
C. are
D. is
单项选择题
The barrier was used ______ protection which kept the enemy out of frontier towns.
A. as means of
B. as mean of
C. as a means of
D. as a mean of
相关试题