it would have been
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it would have been better to do：虚拟语气的用法,意思是“过去如果做了某事会更好”,表明过去没有做该事.
it would be better to do：（表示现在）用委婉的说法来提出建议或者一般过去式,是陈述语气,有没有做并不清楚~
