单项选择题

According to a recent scientific report, human beings are likely to travel ______ the speed of light in near future.

A．to
B．for
C．at
D．by
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单项选择题
When the heavy snow started, it was ______ noon.
A．hardly
B．closely
C．nearly
D．mostly
单项选择题
It is time that the children ______.
A．went to bed
B．should go to bed
C．going to bed
D．have to go to bed
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