单项选择题

The grass ______ many animals live is abundant here.

A．by which
B．with which
C．on which
D．of which
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单项选择题
Every year when the flu is ______, I'm bound to get sick.
A．getting around
B．coming around
C．hanging around
D．going around
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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