问题描述：
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也说得通,为什么却不填它而填could have done?
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