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    科目： 来源：上海高考真题 题型：单选题

    Small sailboats can easily turn over in the water _____ they are not managed carefully.
    [     ]
    A. though
    B. before
    C. until
    D. if

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    科目： 来源：上海高考真题 题型：单选题

    — Are you ready for Spain? 
    — Yes. I want the girls to experience that _____ they are young.

    [     ]

    A. while
    B. until
    C. if
    D. before

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    科目： 来源：浙江省高考真题 题型：单选题

    We won't keep winning games _____ we keep playing well.
    [     ]
    A. because
    B. unless
    C. when
    D. while

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    科目： 来源：四川省高考真题 题型：单选题

    — Why didn't you tell him about the meeting?
    — He rushed out of the room _____ I could say a word.
    [     ]
    A. before
    B. until
    C. when
    D. after

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    科目： 来源：福建省高考真题 题型：单选题

    Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.
    [     ]
    A. since
    B. after
    C. before
    D. when

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    科目： 来源：高考真题 题型：单选题

    I do every single bit of housework _____ my husband Bob just does the dishes now and then.
    [     ]
    A. since
    B. while
    C. when
    D. as

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    科目： 来源：江苏高考真题 题型：单选题

    _____ environmental damage is done, it takes many years for the ecosystem (生态系统) to recover.
    [     ]
    A. Even if
    B. If only
    C. While
    D. Once

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    科目： 来源：高考真题 题型：单选题

    Several weeks had gone by ______ I realized the painting was missing.
    [     ]
    A. as
    B. before
    C. since
    D. when

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    科目： 来源：高考真题 题型：单选题

    _____ you call me to say you're not coming, I'll see you at the theatre.
    [     ]
    A. Though
    B. Whether
    C. Until
    D. Unless

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    科目： 来源：山东省高考真题 题型：单选题

    It was some time ______ we realized the truth.
    [     ]
    A. when
    B. until
    C. since
    D. before

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