单项选择题

Young ______ he is, he knows what is the right thing to do.

A．that
B．as
C．although
D．however
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单项选择题
If you don' t put the milk in the refrigerator, it may _______.
A．go by
B．go off
C．go on
D．go back
单项选择题
Cancellation of the flight ______ many passengers to spend the night at the airport.
A．resulted
B．obliged
C．demanded
D．recommended
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