单项选择题

If a substance is dissolved in water or heated, it may ______ a gas.

A．give into
B．give off
C．give over
D．give away
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单项选择题
You ______ that letter to James. However, you didn't.
A．ought to write
B．ought to have written
C．should write
D．should be writing
单项选择题
My father has promised to put his car entirely at our ______ for the holiday.
A．disposal
B．usage
C．pleasure
D．disposition
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