单项选择题

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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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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