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听力题目：
3. (A). I’m having difficulty putting the facts in order.
(B). I could have gotten a map at the factory very easily.
(C). Knowing the difficulty, I could have found a solution.
(D). With a map, it would have been easy to locate the factory.
4. (A). The door was open, but I didn’t go in.
(B). I opened the door myself.
(C). Since the door was open, I came in.
(D). She opened the door to let me in.
