单项选择题

Surveys show that ______ less sleep than we think, ______ too much sleep could even harm our health.

A．not only do we need, but that
B．not only we need, but also
C．not only we need, but that
D．not only do we need, but also
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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
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
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