Mary liked to look back on her high—school days， she thought were the happiest in her life．
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that
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what
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when
推荐题目
There is no possibility ______ all the students can pass the college entrance examination.
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what
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which
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that
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whether
13. For many cities in the world, there is no room to spread out further, _______ New York is an example.14.
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for which
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in which
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of which
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from which
—I can never forget the day ___ we spent together in the summer camp．—Well, especially the day _______it suddenly began to rain in the middle of the night．
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when; when
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which; when
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what; that
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on which; when
—All the building materials have been washed away.—So I have heard. But there was no sign ____ a heavy rain was on the way last night.
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when
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that
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which
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If
---- Did he come back early last night? ---- Yes. It was not yet eight o’clock _______ he arrived home.
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when
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that
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before
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until