English teachers are supposed their students a test in class even after class better t

问题补充：

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

答案：

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。