单项选择题

You see the lightning ______ it happens, but you hear the thunder later.

A．the instant
B．on the instant
C．for an instant
D．in an instant
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As ______ clear from his manners, he is a teacher.
A．being
B．is
C．to be
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I know you think I'm talking nonsense, but ______ you will realize I am right.
A．at one time
B．in time
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