单项选择题

So fast ________ that it is difficult for us to imagine its speed.

A．has light traveled
B．light travels
C．does light travel
D．travels light
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单项选择题
We’ve just installed central heating, ________ should make a tremendous difference to the house next winter.
A．what
B．that
C．it
D．which
单项选择题
It was the end of my exhausting first day as a waitress, and I really appreciated ________ time to relax.
A．to have
B．having
C．to have had
D．of having
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