【題目】Each class lasts 50 minutes in our school. (改為否定句)
Each class 50 minutes in our school.

【答案】doesn't;last
【解析】句意:在我們學(xué)校每節(jié)課持續(xù)50分鐘。主語是each class, 謂語動(dòng)詞要用單數(shù),lasts是行為動(dòng)詞,變成否定句要用助動(dòng)詞doesn't+動(dòng)詞原形,故答案為doesn't last。

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