单项选择题

I won't come to the party unless Peter ______.

A． invites
B． is invited
C． will invite
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单项选择题
Teachers told us ______ here; it's dangerous.
A． to swim
B． not to swim
C． to not swim
单项选择题
The environment here is wonderful! ______ of the land ______ covered with trees and grass.
A． Two fifths; is
B． Two fifth; is
C． Two fifths; are
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