问题
选择题
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
答案：C
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。