If the letter to be mailing was placed on the writing table an hour ago,it is certain being there no

If the letter to be mailing was placed on the writing table an hour ago,it is certain being there no

题目
If the letter to be mailing was placed on the writing table an hour ago,it is certain being there now.
In the long run,however,this hurry to shed full-time staff may be more harmful to industry as it is to the workforce.
各有一个错误.请分析详细一点.
答案
上边一个改mailing为mailed 主动为被动,信不能主动寄出
后一题as 改为than 比较 more harmful……than
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
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想找英语初三上学期的首字母填空练习……
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