单项选择题

Once our chickens started laying eggs, we had such a ______ of eggs that we were giving many away to our neighbors.

A．output
B．surplus
C．production
D．plenty
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单项选择题
You ______ that letter to James. However, you didn't.
A．ought to write
B．ought to have written
C．should write
D．should be writing
单项选择题
To their credit the Department of Energy ______ these ideas and funded a detailed study.
A．took over
B．took on
C．took up
D．took to
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