单项选择题

They recommended （）smaller heating and cooling systems.

A．to use
B．to be used
C．being used
D．using

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单项选择题
（）the book again, she discovered that she had missed a lot in her first reading.

A．While reading
B．When read
C．As reading
D．In reading
单项选择题
This is one of the foods that my doctor has forbidden me （）.

A．eating
B．to eat
C．eat
D．to be eaten
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