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    科目： 来源：不详 题型：单选题

    Will you help him________ you see an old man in trouble ?
    A．thoughB．so C．becauseD．when

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    科目： 来源：不详 题型：单选题

    We must never think that we are good at everything __________ others are good at nothing.
    A．sinceB．howeverC．whileD．as

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    科目： 来源：不详 题型：单选题

    People often have this belief ___development is bad for the environment, but this does not have to be true.
    A which     B whose       C that       D when

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    科目： 来源：不详 题型：单选题

    _______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby.
    A．WhileB．WhenC．SinceD．if only

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    科目： 来源：不详 题型：单选题

        you understand this rule, you’ll have no further difficulty.
    A．UntilB．UnlessC．ThoughD．Once

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    科目： 来源：不详 题型：单选题

    ___________there are many different types of food, some animals spend their lives eating only one type.
    A．SinceB．Unless C．OnceD．While

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    科目： 来源：不详 题型：单选题

    You shouldn’t have failed the job interview. Why didn’t you do ___ the expert suggested?
    A．ifB．whenC．asD．because

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    科目： 来源：不详 题型：单选题

    Your parents have given you all the facts _____ you can judge for yourself easily
    A．even ifB．as ifC．such thatD．so that

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    科目： 来源：不详 题型：单选题

    —What do you think about the new teacher?
    —________ the new teacher is an elegant lady, she can be extremely difficult to work with.
    A．As ifB．As long asC．BecauseD．While

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    科目： 来源：不详 题型：单选题

    — What a shame ! It turned out to be a failure.
    — We missed a process,_______ we could not succeed in the experiment.
    A．and otherwiseB．and thereforeC．or perhapsD．but luckily

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