单项选择题

——_________does Mr. Johnson go to London on business ——At least once a month.

A．How many
B．How long
C．How often
D．How
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单项选择题
The goods_________ when we arrived at the airport.
A．were just unloading
B．were just been unloading
C．had just unloaded
D．were just being unloaded
单项选择题
I can’’t find the recorder in the room. It________ by somebody.
A．must have taken
B．may have taken
C．may have been taken
D．should have been taken
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