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 time to play games, ______ your sports shoes, please.
A． Put away
B． Put on
C． Put up
单项选择题
What ______ to Tom yesterday
A． happened
B． has happened
C． was happened
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