单项选择题

Jack spent two hours ______ a picture.

A．drawing
B．to draw
C．for drawing
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单项选择题
The old farmer you see here ______ in the village all his life.
A．lives
B．has lived
C．lived
单项选择题
Since I began to work here three years ago, this factory ______ in size.
A．had doubled
B．has doubled
C．doubled
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