单项选择题

[A] off [C] to
[B] with [D] by

A．off
B．with
C．to
D．by
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单项选择题
[A] that [C] when[B] where [D] as
A．that
B．where
C．when
D．as
单项选择题
[A] escape [C] dry[B] drain [D] leak
A．escape
B．drain
C．dry
D．leak
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