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    科目： 来源：北京市期末题 题型：单选题

    Scientists say it still needs five or six years _____ it is possible for human patients to take this medicine.
    [     ]
    A. since
    B. before
    C. after
    D. when

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    科目： 来源：北京市期末题 题型：单选题

    —It's a long story, but there are not any new words in it.
    —Good! _______ it will be hard for children.
    [     ]
    A. So
    B. Or
    C. But
    D. And

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    科目： 来源：江苏省期末题 题型：单选题

    I haven't heard from Bill _____ he left here. 
    [     ]
    A. when
    B. before
    C. since
    D. while

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    科目： 来源：江苏省期末题 题型：单选题

    Mr Smith usually reads a newspaper _____ he's waiting for the bus.
    [     ]
    A. if
    B. then
    C. because
    D. while

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    科目： 来源：天津模拟题 题型：单选题

    Someone called me at midnight, but he hung up _____ I could answer it.
    [     ]
    A. as
    B. since
    C. after
    D. before

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    科目： 来源：江苏模拟题 题型：单选题

    _______ I have a lot of housework to do, I still finish my homework on time.
    [     ]
    A. Unless
    B. If
    C. Although
    D. So that

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    科目： 来源：0115 模拟题 题型：单选题

    He met many problems ______ he was going over his lessons.
    [     ]
    A. before
    B. as soon as
    C. since
    D. while

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    科目： 来源：上海模拟题 题型：单选题

    ______ it rained heavily, they arrived at Shanghai Grand Theatre in time.
    [     ]
    A. But
    B. Though
    C. Because
    D. If

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    科目： 来源：上海模拟题 题型：单选题

    Miss Wang asked me ________ I was busy with the test those days.
    [     ]
    A. that
    B. if
    C. when
    D. what

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    科目： 来源：天津市期末题 题型：单选题

    Make sure _____ he is at home or not before you call on him.
    [     ]
    A. if
    B. whether
    C. what
    D. how

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