单项选择题

The mechanic examined the car engine ______ but could find nothing wrong with it.

A．throughout
B．exactly
C．thoroughly
D．altogether
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单项选择题
Nowhere else in the world ______ more attractive scenery than Switzerland.
A．you can find
B．has been found
C．can you find
D．you have found
单项选择题
If you try to learn too many things at a time, you may get ______.
A．confused
B．confusing
C．confuse
D．confuses
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