who whom which when where why
... 用来引导同位语从句 who whom which when where why 不能引导同位语从句 if 引导同位语从句 that ...
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who, whom, which, when, where, why
who, whom, which, when, where, why用来引导同位语从句 The question who should do the work requires consideration.谁该干这项工作，这个问题需要考虑。
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