单项选择题

Call your doctor for advice if the ______ persist for more than a few days.

A．responses
B．reflections
C．symptoms
D．syndromes
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单项选择题
It is human nature to think back to a Golden Age ______ one's country was strong and respected.
A．unless
B．provided
C．as
D．when
单项选择题
The police accused him of setting fire to the building but he denied ______ in the area on the night of the fire.
A．to be
B．to have been
C．having been
D．be
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