单项选择题

I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.

A．while
B．since
C．after
D．as
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单项选择题
______ she realized it was too late to go home.
A．No sooner it grew dark than
B．Hardly did it grow dark that
C．Scarcely had it grown dark titan
D．It was not until dark that
单项选择题
Call your doctor for advice if the ______ persist for more than a few days.
A．responses
B．signals
C．symptoms
D．reflections
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