A、Under a piece of stone. B、Under the window. C、In the kitchen. D、Near the living-room. A“我”将钥匙放在门边的一块石头下，而朋友却从一个开着的窗子进了房。A项正确。

An old friend from abroad, whom I was expecting to stay with me, telephoned from the airport to tell me that he had arrived. I was still at the office at the time, but I had made arrangements for his arrival. After explaining where my new flat was, I told him that I had left the key under a stone near tile door. As I was likely .to be at home rather late, I advised him to go into the kitchen and help himself to food and drink.
    Two hours later, my friend telephoned me from the flat. At the moment, he said, he was listening to some of my records after having just had a truly wonderful meal. He had found a pan on the gas stove and fried two eggs and had helped himself to some cold chicken from the refrigerator. Now he sail he was drinking a glass of orange juice and he hoped I would join him. I asked him if he had reached the flat without difficulty, he answered that he had not been able to find the key under the stone, but fortunately the living-room window just by the apple tree had been open and he had climbed in. I listened to all this in astonishment. There is no apple tree in front of my living-room, but there is one in front of my neighbor’s.