都可以.做从属连词时,能用while的地方都可以用when,反过来则不然.
知识点延伸：
做从属连词使用时,while要用在延续性动词的句子中,而when即可用在延续性动词的句子中,也可用在瞬间性动词的句子中.while完全可以被when取代.
祝你进步
She looked after my baby while I was away
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