no...but...的意思是:不…但是… 举例: 1.I had no option but to pretend ignorance. 我别无他法,只能假装不知道。 2.We had no option but to abandon the meeting. 我们别无选择,只有放弃这次会面。 not...but...的意思是:不是…而是… 举例: I'm not sure* but it sounds like Miya's mother. More @Wikipedia
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