单项选择题

The way I thought of______the animal was of great value.

A．protecting
B．protect
C．being protected
D．to protect
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单项选择题
It is no ______ talking to him, because he will never change his mind.
A．help
B．use
C．time
D．way
单项选择题
______ is often the case, we have worked out the production plan.
A．Which
B．When
C．What
D．As
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