不能查询到所有姓“李"的学生信息的SQL命令是（ ） A: SELECTsno,sname FROM studentInfo WHERE sname LIKE "李%"; B: SELECTsno,sname FROM studentInfo WHERE sname = "李"; C: SELECTsno,sname FROM studentInfoWHERE left(sname,1) = "李";