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    科目： 来源：不详 题型：单选题

    Qian Xuesen tried many times _________ he found the solution to the puzzle about space technology.
    A．afterB．beforeC．sinceD．when

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    科目： 来源：不详 题型：单选题

    Physical Education in schools can teach us endurance — something we all need ______ life becomes tough.
    A．unlessB．in caseC．thoughD．until

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    科目： 来源：不详 题型：单选题

    He thought she was a pretty girl     poorly she was dressed.
    A．howB．as thoughC．as long asD．however

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    科目： 来源：不详 题型：单选题

    We were about to go out for a walk ______ it began to rain.
    A．whileB．beforeC．asD．when

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    科目： 来源：不详 题型：单选题

    _______ excited his parents most is that he had passed the entrance exam and was admitted into his dream college.
    A．ThatB．WhatC．WhichD．It

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    科目： 来源：不详 题型：单选题

    Be quick, _____ we’ll miss the beginning of the fireworks display in the park.
    A．soB．orC．becauseD．though

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    科目： 来源：不详 题型：单选题

    Many people can't learn any lessons from the mistakes they've made _____ they get hurt somehow.
    A．whetherB．unlessC．ifD．as

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    科目： 来源：不详 题型：单选题

    Martin drove along ______ he found a convenient parking place．
    A．afterB．whenC．untilD．since

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    科目： 来源：不详 题型：单选题

    --What are you going to do this weekend？
    --I will go to visit my grandparents _____ I have time.
    A. as far as     B. as much as      C. as long as     D as many as

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