When the teacher came into the classroom, all of us __________ the classroom.
A. are cleaning   
B. were cleaning   
C. cleaned
D are  cleaned
B
句意：當(dāng)老師走進(jìn)教室的時(shí)候，我們所有人都正在打掃教室。根據(jù)前面句子的時(shí)態(tài)可知后面應(yīng)用過去進(jìn)行時(shí)。
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