We must do something before it'll be too late.改错,这句话哪里错了,找出语病!

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• We must do something before it'll be too late.改错,这句话哪里错了,找出语病!
• We must do something before it'll be too late.改错,这句话哪里错了,找出语病!
• find,card,must,ID,she,her,scgool,(.)连词成句 Mike is not in the c_____,he is ib the l____.1）find,card,must,ID,she,her,scgool,(.)连词成句 2）Mike is not in the c_____,he is ib the l____.根据句意及首字母提示完成单词3）Thanks for your help.写出答语4）如果多项式x^m-(n+3)x+5是关于x的二次二项式,求n^m的值.（注：^为x的x次方）5）关于x的多项式（a-4)x^3-x^m+2x-m.（提示：a^0=1,a≠0）①若它是一个二次三项式,求a和m；②若它是一个三次三项式,求a和m满足的条件.
• You’d rather tell him the truth before it is too late.为什么用rather?