单项选择题

Of particular interest to visitors ______ the large number of bookstores that sell books in different languages.

A．is
B．are
C．being
D．was
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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
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
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