A、It was dead on the way to London.
B、It flew away from the cage.
C、It was stolen by someone.
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试题解析
考 点：细节题。由第二段第二句“But on his way to the boss’ s home, one of them flew out of the cage and there were only three birds left in it.”可知4只鸟中有一只飞走了。
