By 17:30, ______ was almost closing time, nearly all the paintings had been sold.
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which
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when
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what
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that
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The days are gone________you can breathe fresh，unpolluted air or drink clean, unpolluted water in the countryside.
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when
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that
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where
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which
Luckily，we’d brought a road map without____we would have lost our way.
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it
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that
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this
D
which
Great changes have taken place in that school. It’s no longer ___ it was 20 years ago, ____ it was so poor.
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what, when
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that, which
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what, which
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which, that
– When did you graduate from college?– It was in 2003 ____ you were in middle school.
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that
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when
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which
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then
----- Believe it or not, my sister and I are twins. ----Oh, you must have had the case ________ you were taken for your sister.
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which
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whose
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where
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whom