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    【题目】Some theories believe ____ quality input ensures quality output in English learning.

    A. how

    B. that

    C. why

    D. what

    【答案】B

    【解析】

    考查宾语从句。句意：一些理论认为在英语学习方面高质量的输入确保了高质量的输出。句中that引导的宾语从句that quality input ensures quality output in English learning做动词believe的宾语，that在句中不充当任何成分，也没有任何含义，可以省略。故B项正确。

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