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    18．cough（　　）
    A．roughB．foughtC．thoughD．sought

    分析 cough/k?：f/划线部分的字母组合ou读作/?：/；

    解答 答案：B．D    
    A．rough/r?f/划线部分的字母组合ou的发音/?/；   B．和D．fought/f?：t/和sought/s?：t/划线部分字母组合ou的发音都是/?：/与cough划线部分相同；C．though/???/划线部分的字母组合ou读作/??/；故选B，D

    点评 本题有两个答案BD．

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