单项选择题

The average wavelength of visible light is 2,000 times ______ the diameter of an atom.

A. much as
B. greater than
C. as great
D. more than that
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单项选择题
The country has already sent up three unmanned spacecraft, the most recent ______ at the end of last May.
A. has been launched
B. having been launched
C. being launched
D. to be launched
单项选择题
It's high time that you ______ working.
A. stopped
B. had to stop
C. shall stop
D. stop
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