单项选择题

The stones ______ houses and bridges.

A．are used to build
B．used to build
C．are used to building
D．used to building
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单项选择题
I have ______ gone over my lessons, but he hasn't ______.
A．already,already
B．already,yet
C．yet,already
D．yet,yet
单项选择题
It's a long time since he left his hometown, ______
A．didn't he
B．hadn't he
C．wasn't it
D．isn't it
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