单项选择题

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

A. the instant


B. for an instant
C. on the instant


D. in an instant
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Busy ______ he is, he can fulfill the task ahead of schedule.
A. because
B. as

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He is not under arrest, ______ any restriction on him.
A. or the police have placed
B. or have the police placed
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D. nor have the police placed
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