单项选择题

The day ______ I shall never forget is the one ______ I joined the army.

A．that… where
B．when… in which
C．which… when
D．on which… why
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单项选择题
The paint is still wet. ______!
A．Be not sure to touch it
B．Be sure not to touch it
C．Be sure to not touch it
D．Don't be sure to touch it
单项选择题
His ears are highly sensitive ______ any unusual sound in the machine.
A．of
B．on
C．to
D．by
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