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notsooner与nosoonerI'llgettherebysix,if(notsooner).在这句话中为什么要用notsooner,而不用nosooner?

题目详情
not sooner与 no sooner
I'll get there by six,if (not sooner).在这句话中为什么要用not sooner,而不用no sooner?
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答案和解析
一般没有NO SOONER这种用法,只有no sooner...than,一...就...:
He had no sooner/No sooner had he arrived than he was asked to leave again.他刚到就被支走了