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Under more favourable conditions,we __ better.此处should do也说得

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Under more favourable conditions,we __ better.此处should do也说得通,为什么却不填它而填could ha...
Under more favourable conditions,we __ better.此处should do也说得通,为什么却不填它而填could have done?
Under more favourable conditions,we __ better.此处should do也说得
看上半句你可以感觉到这事情已经发生,要是在更有利的条件下
should do 表示的是之前还没有做过
could have done 表示的是已经做过
所以要谈论已经发生的事情,用could have done