单选题
The old always assume that they know best for the simple reason ______ they have been around a bit longer.
【正确答案】
B
【答案解析】that引导同位语从句，先行词是reason。考生应该记住：for the simple reason that…是惯用法，reason后面不用别的连词，尤其注意不能接why，因为此处是同位语从句而不是定语从句。试比较：
定语从句：The reason why he came late is that(不能用because)his car broke down.
同位语从句：He came late for the simple reason that his car broke down.