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：句意：英语老师理应让同学们在课堂上甚至是课后进行一次测试，来确保更好的教学效果。be supposed to do sth.理应干某事；后一空用动词不定式做目的状语。故选C。