They are busy ( ) a research ( ) environment A to,on B on,at C with,on D with,at 選哪個 為什么
They are busy ( ) a research ( ) environment A to,on B on,at C with,on D with,at 選哪個 為什么
英語人氣：754 ℃時間：2019-11-01 14:17:22
優(yōu)質(zhì)解答
選C.be busy with sth忙于某事,on sth 關(guān)于...
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