舞韵瑜伽倾国倾城教学:Microsoft JET Database Engine (0x80040E14) 语法错误 (操作符丢失)

<% Dim DB
DB="example.mdb"
set conn=server.CreateObject("adodb.connection")
conn.open "provider=Microsoft.Jet.OLEDB.4.0; Data Source="&server.MapPath(DB)

exec="select * from Guestbook where id="&request.querystring("id")
set rs=server.CreateObject("adodb.recordset")
rs.open exec,conn,1,1

%>

<form name="form1" method="post" action="modify.asp">
<table width="200" border="1">
<tr>
<td>姓名</td>
<td>电话</td>
</tr>
<% do while not rs.eof%><tr>
<td><input name="name" type="text" value="<% =rs("name")%>"></td>
<td><input name="tel" type="text" value="<% =rs("tel")%>"></td>
</tr>
<tr>
<td>
<div align="center">
<input type="submit" name="Submit" value="提交">
</div></td>
<td><input name="hidden" type="text" id="hidden" value="<% =request.querystring("id")%>"></td>
</tr>
<% rs.movenext
loop
%>
</table>
</form>

<% rs.close
set rs=nothing
conn.close
set conn=nothing

%>

提示:

错误类型：
Microsoft JET Database Engine (0x80040E14)
语法错误 (操作符丢失) 在查询表达式 'id=' 中。

那位帮我看看怎么回事 谢谢!