单项选择题

Before 8,000 B.C. wheat did not grow as prolifically ______ it does today.

A．like
B．as
C．for
D．than
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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
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
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