______the students clean their classroom every day yes,they clean them after school
______the students clean their classroom every day yes,they clean them after school
A.Do
B.Are
A.Do
B.Are
英语人气：328 ℃时间：2019-08-20 03:14:34
优质解答
Awhy?clean 是动作动词的原形，加上do这个助动词，共同做了谓语动词，do提前后，句子变为一般疑问句；而are clean是两个动词原形连用，语法是不允许的，没有这种时态。
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