单项选择题

There is no doubt that he is a good professor ______ he is doing fine.

A．but
B．because
C．so
D．yet
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单项选择题
The head of the company promised to deal with matters of this sort ______ he returned to his office.
A．until
B．while
C．by the time
D．the moment
单项选择题
______ a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.
A．As
B．With
C．Once
D．While
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