单项选择题

The workers are busy ______ the house.

A．to build
B．built
C．building
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单项选择题
—What ______ is Jim's shirt—It's green.
A．time
B．number
C．colour
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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