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83. A report by the American Academy for the Advancement of Science has concluded that much of the currently uncontrolled dioxins to which North Americans are exposed comes from the incineration of wastes.
(A) much of the currently uncontrolled dioxins to which North Americans are exposed comes
(B) much of the currently uncontrolled dioxins that North Americans are exposed to come
(C) much of the dioxins that are currently uncontrolled and that North Americans are
exposed to comes
(D) many of the dioxins that are currently uncontrolled and North Americans are exposed to come
(E) many of the currently uncontrolled dioxins to which North Americans are exposed come
答案解析如下：
(A)much of the currently uncontrolled dioxins to which North Americans are exposed comes
【错误】 主谓一致：“dioxins”是“dioxin”的复数，因此与“comes”主谓不一致，且与用于不可数名词的“much of”不搭配。
(B)much of the currently uncontrolled dioxins that North Americans are exposed to come
【错误】 主谓一致：主语“much of the currently uncontrolled dioxins”内部“much of”与“dioxins”不搭配。
(C)much of the dioxins that are currently uncontrolled and that North Americans are exposed to comes
【错误】 主谓一致：见(A)。
(D)many of the dioxins that are currently uncontrolled and North Americans are exposed to come
【错误】 平行结构：“that are currently uncontrolled and North Americans are exposed to”中“North Americans”之前应再添加一个“that”才能准确地构成两个定语从句平行的结构。
(E)many of the currently uncontrolled dioxins to which North Americans are exposed come
【正确】 定语从句“to which North Americans are exposed”明确地修饰了“dioxins”。“many”与复数形式的“dioxins”搭配合理。“come”与“many of the currently uncontrolled dioxins”保持了主谓一致。
【大意】 AAAS的一份报告得出结论：很多北美人接触到的二噁英来自垃圾焚烧。
【最优解题思路推荐】
“much of”无法与“dioxins”搭配，立即排除(A)、(B)和(C)。
(D)中两个“完整的”定语从句平行时，第二个定语从句的“that(which)”不可随意省略，排除。
因此选择(E)。
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