单项选择题

They accept that what you are doing is ______ to their problems.

A．dependent
B．connecting
C．relevant
D．concerned
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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
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
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