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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单项选择题
We were just ______ calling you up ______ you came in, ______ was unexpected.
A．about; when; that
B．on the point of; as; as
C．on the point of; when; which
D．on the point of; as; as
单项选择题
According to the rules of the factory, you mustn't ask for leave ______ you have a doctor's note.
A．unless
B．on condition
C．though
D．until
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