单项选择题

One of the benefits of the new model is that it is easier______ than the old one.

A．operating
B．to be operated
C．to operate
D．operated
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单项选择题
I'd like to ______a special table for the coming Valentine's Day.
A．preserve
B．deserve
C．conserve
D．reserve
单项选择题
When he was set free after twenty years in prison, he was amazed ______the changed world he found.
A．at
B．of
C．on
D．to
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