单项选择题

Several thousands of trees ___________in our city every year.

A．have planted
B．has been planted
C．are planted
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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
What ___________food you've cooked! We like it very much.
A．famous
B．usual
C．delicious
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