单项选择题

I purposely ______ from extending these observations to any length.

A．abstain
B．sustain
C．retain
D．detain
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单项选择题
Sometimes the bank manager himself is asked to ______ checks ff his clerks are not sure about them.
A．credit
B．assure
C．certify
D．access
单项选择题
Some day those pictures will be ______ more than all you have in your shop.
A．worthy
B．worth
C．worthwhile
D．worthless
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