有一本教辅材料上说：“当先行词是 those 时，定语从句的关系词只能用 who（或 whom）。”果真是这样吗？
当those指人时,其关系代词既可以使用who,也可以使用that;当those指物时,其关系代词既可以使用that,也可以使用which(当关系代词作宾语时,则可以省略)(参见those ):
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Those (people) who would like to go on the trip should put their names on the list. 那些要去旅行的人须在表中登记姓名。
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The best readers are those that know how to skip, and I'm a good skipper. 善于阅读的人是知道怎样跳读的人，而我就是好的跳读者。
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For two millennium, Christian soldiers had defended their faith against those who tried to displace it. (Dan Brown, The Da Vinci Code) 两千年来，基督教卫士们一直保卫着他们的信仰，抗击着企图取代它的各种信仰。（《达·芬奇密码》）
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Throw away all those which are unfit for use. 把那些不适用的东西都扔掉。请做下面的英语试题： All of the flowers now raised here have developed from those ____ in the forest. A. once they grew B. they grew once C. that once grew D. once grew