（2014年北京市西城区高三5月二模试题）31. A person who has never tasted bitter won’t know ______ sweet is.
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A
which
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what
C
when
D
why
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_ ____ and I will hit you.
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A
If you say that again
B
Say that again
C
Say you that again
D
You’ll say that again
--- How are you feeling here? --- It’s quite hot. I don’t know _____ to go or stay.
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how
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when
C
whether
D
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—We can use QQ to talk with each other on the Internet.—Really? But can you tell me _______it.
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A
how I can use
B
how can I use
C
why can I use
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Experts believe people can waste less food by shopping only when it is necessary.
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A
why
B
where
C
that
D
what