单项选择题

Your letters ______ those pleasant days when we worked together, I'll remember forever.

A．call out
B．call for
C．call up
D．call on
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单项选择题
The club members voted to ______ the ban on smoking.
A．refrain
B．repeal
C．repel
D．reside
单项选择题
Martin asked his professor for some comments on his report but it was ______.
A．turned down
B．turned off
C．turned up
D．turned on
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