那次事故之后，很多事情都变了。
A lot has changed since the accident.
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lot英 /lɒt/|美 /lɑt/
解释
a lot 作为主语代词，指「大量的事情/变化」，代替具体名词短语，谓语用单数 has changed
A lot has changed since the accident.
a lot 作为主语代词，指「大量的事情/变化」，代替具体名词短语，谓语用单数 has changed