单项选择题

Doctors often make higher _________ for their works than they should.

A．charges
B．bills
C．costs
D．payments
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单项选择题
He might have been killed _________ the timely arrival of the ambulance.
A．but for
B．except for
C．besides
D．except
单项选择题
______ that the formation of the sun, the planets, and other stars began with the condensation of an interstellar gas cloud.
A．It is believed
B．Believing
C．Being believed
D．To believe
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