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
A comet is distinguished from other bodies in the solar system ______.
A．into its appearance
B．off its appearance
C．by its appearance
D．to its appearance
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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