Addition of any chemical compound to the environment in quantities ______ a significant fraction of the total content of gasolin

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问题 Addition of any chemical compound to the environment in quantities ______ a significant fraction of the total content of gasoline may have unexpected environmental consequences.

选项 A、that constitute
B、which constitutes
C、that are substituted by
D、which substitute

答案A

解析语法结构要求时态统一，故选A。

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考博英语

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