单项选择题

It's the first time that she has been to the United States, ______

A．isn't she
B．hasn't she
C．isn' t it
D．hasn't it
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单项选择题
George is one of those people who ______ trouble in working out this problem.
A．has
B．have
C．get
D．gets
单项选择题
Maine has ______ weather than most of the other states in the continental United States.
A．a cooler
B．the coolest
C．cooler
D．the cooler
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