please concentrate on what you are doing中的what有什么用啊?

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• do you remember what you were doing中的复合句有哪些?
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• please concentrate on what you are doing中的what有什么用啊?
• jim,could you tell me where we can get some food to tea?what kind of food are you looking for?回答的句子发现是be doing应为有are 和looking ,那么问句没有体现进行时态啊!不得问句和答句一个时态吗?
• 如图A-4所示,一粗细均匀的U形管内装有同种液体竖直放置,右管口用盖板A密闭一部分气体,左管口开口,两液面高度差为h,U形管中液柱总长为4h.现拿去盖板,液柱开始流动,当两侧液面恰好相齐时右侧液面下降的速度大小为多少?（管的内部横截面积很小
• where are you what are you doing whg not answer me?please call me!