单项选择题

_________ in 1943 _________ the harmful smog made its appearance in Los Angeles.

A．Only/that
B．It was/then
C．That it was/when
D．It was/that
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单项选择题
The car won't start because the battery has _________.
A．run up
B．run over
C．run down
D．run off
单项选择题
He asked _________ since he had been chairman for seven years.
A．not to have been re-elected
B．to be not re-elected
C．not to be re-elected
D．to have not been re-elected
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