先行词被序数词、 形容词最高级、 the only, the very, the last等修饰时, 关系代词通常只用that, 不用which who 等等关系代词了.例如:
①The first English novel (序数词)that I read was Cities. 我读的第一本英文小说是《城市》。
② This is one of the most exciting football games(最高级) that I have ever seen. 这是我见过的最激动人心的足球比赛之一。
③ This is the only thing (the only)that we can do now. 这是我们现在惟一能做的事情。
but 如果不是上述几种情况 就不一定只能用that了 可以用具体的who 或which等等。。
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