I took the envelope and left the rock where Andy had left it, and Andy's friend before him.
我拿起信封，把石头放回安迪和他已过世的朋友原先放置的地方。
The plane had left before I got to the airport. (the plane left before I got to the airport.)
我到飞机场时，飞机已经离开了。
The plane had left before I got to the airport. (the plane left before I got to the airport.)
我到飞机场时，飞机已经离开了。
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