English teachers are supposed ________ their students a test in class, even after class, ________ better teaching results.
A．to give; ensuringB．giving; to ensure
C．to give; to ensureD．giving; ensuring
C
C　考查非謂語(yǔ)動(dòng)詞的用法。be supposed to do sth.“應(yīng)該做某事”，排除選項(xiàng)B和D；第二空是動(dòng)詞不定式作目的狀語(yǔ)，即“為了確保更好的教學(xué)效果”。可知C項(xiàng)正確。
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