单项选择题

An oil-field in the North Sea can cost hundreds of millions of pounds to bring into ______.

A．produces
B．productivity
C．production
D．products
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单项选择题
We still know little about outer ______ though we have made much effort in research.
A．heaven
B．universe
C．space
D．sky
单项选择题
______ the balcony, it could have saved me a lot of troubles.
A．Have I known
B．Had I known
C．I have known
D．I had known
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