单项选择题

______ that he wasn't happy with the arrangements, I tried to book a different hotel.

A．Perceiving
B．Penetrating
C．Puzzling
D．Preserving

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单项选择题

It was the first time that such a ______ had to be taken at a British nuclear power station.

A．presentation
B．precaution
C．preparation
D．prediction

单项选择题

This is not an economical way to get more water; ______, it is very expensive.

A．on the other hand
B．on the contrary
C．in short
D．or else

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