单项选择题

Johnson's younger brother, though 6 years old, is very quick ______ doing calculations.

A．of
B．on
C．in
D．by
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单项选择题
The last thing ______ she had done before she got aboard the plane was embracing him.
A．which
B．that
C．to that
D．of which
单项选择题
My mother bought me a new pair of pants on my birthday ______ she had promised.
A．which
B．what
C．with
D．as
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