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 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
单项选择题
I have kept that portrait （） I can see it every day, as it always reminds me of my university days in London.

A. which
B. where
C. whether
D. when
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