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The teacher requested that we ______ the classroom after using it.
A．cleanedB．cleaningC．to cleanD．clean
D

試題分析：考查虛擬語氣。Request后面的賓語從句使用虛擬語氣should+動詞原形構(gòu)成。Should可以省略；D項(xiàng)省略了should.句意：老師要求我們使用完教室以后把教室打掃干凈。故D正確。
點(diǎn)評：Request后面的賓語從句使用虛擬語氣should+動詞原形構(gòu)成。Should可以省略；
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