i don't think everyone could pass it为何用could

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i don't think everyone could pass it为何用could

i don't think everyone could pass it为何用could
i don't think everyone could pass it为何用could

i don't think everyone could pass it为何用could
这里用could来表示一种推测.

could 表示一种虚拟,假使能够。表委婉语气。