单项选择题

Since the airport is closed this morning, it must ______ last night.

A．snow
B．have snowed
C．have been snowed
D．have being snowed
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单项选择题
One of the boys in the class had a fever and he soon ______ other children.
A．infected
B．effected
C．affected
D．perfected
单项选择题
The president ______ a rise in salary for ages, but nothing has happened yet.
A．promised
B．is promised
C．has been promising
D．is promising
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