已知元组tu_num1 = ('p', 'y', 't', ['o', 'n']),请向元组的最后一个列表中添加新元素“h”。
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已知字符串str= 'skdaskerkjsalkj',请统计该字符串中各字母出现的次数。
已知列表li_one = [1,2,1,2,3,5,4,3,5,7,4,7,8],编写程序实现删除列表li_one中重复数据的功能。
It is a joy to hear ________ apologies that are from the bottom of one's heart.
A. real
B. true
C. sincere
D. realistic
He badly _____________ his back digging in the public garden on Children's Day.
A. stretched
B. exerted
C. pulled
D. strained