单项选择题

I know it isn't important but I can't help ______ about it.

A．but to think
B．thinking
C．think
D．to think
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单项选择题
The opening ceremony is a great occasion. It is essential ______ for that.
A．for us to be prepared
B．that we are prepared
C．of us to be prepared
D．our being prepared
单项选择题
By the end of 2001, 559 kinds of products had been ______ green food.
A．named
B．restricted
C．classified
D．labeled
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