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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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
单项选择题
It didn't ______ me that you would object to the decision.
A．occur to
B．hit upon
C．flash to
D．happen to
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