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If you know you're not gonna output a full string %C but a single character, percent C will get that job done.
如果你不想输出一个完整的字符串,而是输出一个字母,就要用到。
For example, the expression a*\|b*c will match a string consisting of any number of as or any number of bs (but not both) terminated by a single c.
例如,表达式 a*\|b*c 匹配由任何数量的 a 或 b 组成(但不是同时)且以一个 c 结尾的字符串。
For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the centre.
每题都有对应标记的A、B、C和D四个选项,请选择最佳选项并在答题卡2的相应字母中间划横线。
If you know you're not gonna output a full string %C but a single character, percent C will get that job done.
如果你不想输出一个完整的字符串,而是输出一个字母,就要用到。
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