单项选择题

The children didn't stop playing games ______ it was time for supper.

A．until
B．if
C．since
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单项选择题
It's not good to be late ______ school.
A．for
B．up
C．at
单项选择题
— Can I help you, sir — Yes. I bought this radio here yesterday, but it ______ .
A．didn't work
B．won't work
C．doesn't work
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