单项选择题

The orchestra(管弦乐队) ______ for about ten minutes when a man in the audience suddenly began shouting.

A．was playing
B．had been played
C．had been playing
D．was played
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There is evidence that this kind of new medicine has no side ______ on the patient.
A．affect
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A good reader is one who can read ______ the lines.
A．between
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