—What a nice classroom!
—It _____ every day.
A．is cleaningB．has cleanedC．must cleanD．is cleaned
D

試題分析：句意：多整潔的教室啊！它每天都被打掃。It指代classroom,教室，與謂語動詞是被動關(guān)系，所以用被動語態(tài):be+過去分詞；故選D。
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