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    English teachers are supposed ________ their students a test in class, even after class, ________ better teaching results.

    A．to give; ensuring B．giving; to ensure

    C．to give; to ensure D．giving; ensuring

     

    C

    【解析】C　考查非谓语动词的用法。be supposed to do sth.“应该做某事”，排除选项B和D；第二空是动词不定式作目的状语，即“为了确保更好的教学效果”。可知C项正确。

     

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