单项选择题

Did you hear someone ______ in the next room all last night

A．moving about
B．moving along
C．moving off
D．moving on
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单项选择题
It's high time that you ______ working.
A．stopped
B．had to stop
C．shall stop
D．stop
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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