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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单项选择题
The medicine is on sale everywhere. You can get it at ______ chemist's.
A．other
B．some
C．certain
D．any
单项选择题
The room is in a terrible mess; it ______ cleaned.
A．can't have been
B．mustn't have been
C．shouldn't have been
D．wouldn't have been
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