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
Such ______ the results of the experiments.
A．is
B．was
C．are
D．as be
单项选择题
The men will have to wait all day ______ the doctor works faster.
A．if
B．unless
C．whether
D．that
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