单项选择题

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
What’s done can’t be undone. It’s no use ______ anyone for it.

A．blaming
B．blame
C．to blame
D．to be blaming
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单项选择题
The existence of electricity in the air has been known ______.
A．for hundreds of years
B．for several years
C．recently
D．for thousands of years
单项选择题
A．workingB．businessC．spareD．empty
A．working
B．business
C．spare
D．empty
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