______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
英語人氣：611 ℃時(shí)間：2019-08-20 03:14:34
優(yōu)質(zhì)解答
Awhy?clean 是動(dòng)作動(dòng)詞的原形，加上do這個(gè)助動(dòng)詞，共同做了謂語動(dòng)詞，do提前后，句子變?yōu)橐话阋蓡柧?；而are clean是兩個(gè)動(dòng)詞原形連用，語法是不允許的，沒有這種時(shí)態(tài)。
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