A cure for cancer is bound one of these days.A、to discoverB、to discoveringC、to

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问题 A cure for cancer is bound one of these days.

选项 A、to discover
B、to discovering
C、to being discovered
D、to be discovered

答案 D

解析句意：近日癌症的治愈方法是必然会发现的。考查动词不定式的被动式。根据上下文to be discovered的修饰对象是a cure for cancer，两者为修饰与被修饰关系：同时含有被动关系。be bound"必然要做的”。

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