He___be at home.Look!the door is locked Amustn't Bcan'tChas to Ddoesn't have to

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• He___be at home.Look!the door is locked Amustn't Bcan'tChas to Ddoesn't have to
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• System.Text.StringBuilder”并不包含“Split”的定义想要以‘c’为分隔,分离字符串,但是提示如题错误,怎么改呢?using System;using System.Collections.Generic;using System.Text;namespace ConsoleApplication5{class Program{static void Main(string[] args){int i;Console.WriteLine("请输入一个字符串:");string str = Console.ReadLine();StringBuilder newstr = new StringBuilder(str);newstr.Insert(3,"abcd");Console.WriteLine(newstr);char[] tor ={ 'c' };string[] str1 = new string[100];str1 = newstr.Split(tor);int
• 英语单项：It's time__about the traffic problem downtown.A.something was done B.everything is done C.anything will be done D.nothing to be done求解,及每个选项的解释 谢谢