题目

下列变形中错误的是（ ） A．m2﹣（2m﹣n﹣p）=m2﹣2m+n+p     B．m﹣n+p﹣q=m﹣（n+q﹣p） C．3m﹣5n﹣1+2p=﹣（﹣3m）﹣[5n﹣（2p﹣1）] D．m+1﹣（﹣n+p）=﹣（﹣1+n﹣m+p） 答案：D(   ) 4.[2014 • 广元] Our city is very clean and beautiful because the streets           every day.   A. clean   B. are cleaned   C. are cleaning