Mary wanted to travel around the world all by herself, but her parents did not ________ her to do so．A.forbidB.allowC.followD.ask
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B解析句意为“玛丽想一个人环游世界，但她的父母不同意她这样做”。由句意可排除A，C两项，从结构上看D可以改为but her parents asked her not to do so。allow sb．to do sth．允许某人做某事。