Our classroom   _______   by us every day!
A．is cleaningB．has cleanedC．must cleanD．is cleaned
D

試題分析: 句意：我們的教室每天由我們來打掃！.is cleaning正在打掃，has cleaned 已經(jīng)打掃，must clean 必須打掃，is cleaned被打掃。根據(jù)by us由我們，可知為被動語態(tài)，故選D。
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