StreamReader，不支持路径格式

文本文件的路径是（D:>Resit quiz>quiz）我收到一个错误，说"不支持给定路径的格式"

var pathToFile = @"..'..'..'D:'Files'quiz.txt";
using (StreamReader sr = new StreamReader(pathToFile, true))
{
    for (int x = 0; x < 50; x++)
    {
        QuestNo[x] = questions[pos].QuestionNum = sr.ReadLine();
        for (int y = 0; y < 1; y++)
        {
            QuestLevel[x] = questions[pos].Level = sr.ReadLine();
        }
        for (int y = 0; y < 1; y++)
        {
            Quest[x] = questions[pos].Question = sr.ReadLine();
        }
        for (int y = 0; y < 1; y++)
        {
            QuestAns[x] = questions[pos].answer = sr.ReadLine();
        }
    }