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
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A. to give; ensuring
B. giving; to ensure
(答案→)C. to give; to ensure
D. giving; ensuring
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。