单项选择题

A programmed computer begins to show on its screen the figures you need（）

A. when switched on
B. switched on
C. to be switched on
D. being switched on

<上一题 目录 下一题>
热门 试题

单项选择题
A new technique（）, the gross output increased by 20 percent.

A. working out
B. having worked out
C. having been worked out
D. to have been worked out
单项选择题
No matter how frequently（）,the works of Beethoven always attract large audiences.

A. performing
B. performed
C. to be performed
D. being performed
相关试题