It was breavery of William__________ encouraged the Swiss people in their fight against the enimies.
A. which
B. that
C. who
D. had
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If he came here at this moment, I__________ him.
A. would criticize
B. will criticize
C. shall criticize
D. were to criticize
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
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。