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    5．Keep working hard，       all your efforts these years will be wasted．（　　）
    A．andB．butC．soD．or

    分析 坚持努力，否则你这些年所有的努力都会白费．

    解答 答案是D，本题考查并列连词的特殊句式．本题中含有特殊句式："祈使句+and/or+一般将来时的句子"=If引导的条件句+主句．or 表示与上文的相反的情况；本句=If you don't work hard，all your efforts these years will be wasted．故D正确．

    点评 首先要理解连词的功能：并列连词连接并列的词、短语或句子；从属连词连接主从句；其次理解各连词含义；最后结合语境做出判断．

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