单项选择题

Susan got sunburned because she ______ on the beach all afternoon.

A．lay
B．is lying
C．has lain
D．had been lying
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单项选择题
In the museum, we saw the model of a house designed by the pioneers and built ______ wood and brick.
A．up
B．on
C．of
D．by
单项选择题
The manager of the restaurant has made it clear that a cook will be immediately fired if he is found ______ in the kitchen.
A．smoke
B．smoked
C．smoking
D．to smoke
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