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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单项选择题
His remarks leg me ______ about his real purpose.
A．wondered
B．wonder
C．to wonder
D．wondering
单项选择题
If the whole opera, on ______ beforehand, a great deal of time and money would have been lost.
A．was not planned
B．has not been planned
C．had not been planned
D．were not planned
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