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
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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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