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．hash' t it
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Lily's little daughter is particularly weak ______ mathematics.
A．at
B．in
C．of
D．with
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This is the best book ______ I' ve ever bought.
A．with which
B．that
C．which
D．when
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