单项选择题

They ______ English for 5 years.

A．have learned
B．learned
C．learn
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单项选择题
Pens ______ by people for writing.
A．use
B．using
C．are used
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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