单项选择题

The new computer virus ______, the system was restored to its normal operation.

A．having removed
B．being removed
C．had been removed
D．was removed
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单项选择题
______, the guest speaker was ushered into the auditorium hall to give the lecture.
A．Being shown around the campus
B．Having shown to the campus
C．After been shown around the campus
D．Having been shown around the campus
单项选择题
The effect of this medicine ______ by midnight, the doctor told Emma You had better not try to read tonight.
A．will wear off
B．wears off
C．will have worn off
D．will be worn off
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