单项选择题

Because of the great speed of light, we see a lamp light up almost at the exact moment______.

A．we turn it on
B．when we turn on it
C．that we turn on it
D．which we turn it on
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单项选择题
They overcame all the difficulties and completed the project two months ahead of time, ______ is something we had not expected.
A．which
B．it
C．that
D．what
单项选择题
It is______ of him to put everything in disorder in the room. He is so peculiar.
A．unconscious
B．aware
C．typical
D．unkind
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