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must have been
phr. 一定是（对过去情况的推测）；一定
have been
已经；一直；（现在完成时态）
would have been done
早就完成了
have been to
去过；已经去过
have been doing
一直做；已经做
have been done
已经完成
have been there before
全都知道；直接了解；亲眼看到
i have been here
我一直在这里
i have been waiting for you
我一直在等你
have been around the block
见多识广；经验丰富
have been there
一直有；去过那儿；到过那里
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