单项选择题

I can't find the key to my office, _________have lost it on my way home.

A．would
B．should
C．must
D．ought to
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单项选择题
There are three colors in the British flag, _________red, white and blue.
A．rarely
B．namely
C．really
D．naturally
单项选择题
The policeman stopped the driver and found that he _________alcohol.
A．drinks
B．has drank
C．is drinking
D．had drunk
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