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Has your brother done his homework_?-----Yes.he has _done it

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Has your brother done his homework_?-----Yes.he has _done it.
A already;already B ever;already C yet;already D yet;yet
look at 与 look for
Has your brother done his homework_?-----Yes.he has _done it
C yet;already
yet用在完成时的疑问句和否定句中,且常放于句末.
already 用在完成时的陈述句中.
而B中的ever也常用在完成时中,但它只能放在句中,不能放于句末.
再问: look at 与 look for 差别
再答: look at 翻译为“看” Look at the map, please. 请看这张地图。 look for 翻译为“寻找” I am looking for my pen . 我在寻找我的钢笔。