题目内容

If he came here at this moment, I__________ him.

A. would criticize
B. will criticize
C. shall criticize
D. were to criticize

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Without your help, I__________ in English study.

A. Would not have succeeded
B. hadn't succeeded
C. will not succeed
D. won't have succeed

简述栈和队列的特点。

如果进栈的元素序列为A,B,C,D,则可能得到的出栈序列有多少种? 写出全部的可能序列。

如果进栈的元素序列为1,2,3,4,5,6,能否得到4,3,5,6,1,2和1,3,5,4,2,6的出栈序列?并说明为什么不能得到或如何得到。