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为什么我会收到语法错误:关键字'AS'附近的语法不正确

我正在使用microsoft visual studio 2005和sql server 2005

string strSql =
 "SELECT a.MCode, a.NameOfModule, a.Mod_Abbreviation, dt.ModuleCode,
  dt.Course, dt.Stage, dt.ModuleGrpFrom, dt.ModuleGrpTo, dt.GrpName,
  dt.GrpType, dt.StaffID, dt.AcadYear, dt.AcadSemester,
  dt.TotalHour, dt.WeeklyLectHr, dt.WeeklyPractHr, dt.WeeklyTutHr,
  dt.ModuleLeader, 0 AS TotalTeach, '' AS ModuleGroups, '' AS ML, 0 AS L, 0 AS P, 0 AS T, 1 AS NofGrp, '' AS TotalTeachUnit" +
 "FROM (SELECT * FROM
  (SELECT a.ModuleCode, a.Course, a.Stage, a.ModuleGrpFrom,
    a.ModuleGrpTo, a.GrpName, a.GrpType, a.StaffID, b.AcadYear,
    b.AcadSemester, b.TotalHour, b.WeeklyLectHr, b.WeeklyPractHr,
    b.WeeklyTutHr, b.ModuleLeader
   FROM ModuleStrGrp a 
   LEFT JOIN ModuleStr …