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

 

C

【解析】C　考查非謂語動詞的用法。be supposed to do sth.“應該做某事”，排除選項B和D；第二空是動詞不定式作目的狀語，即“為了確保更好的教學效果”�？芍狢項正確。

 

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