2. 职称英语
  3. Addition of any chemical compound to the environment in quantities ______ a sign

Addition of any chemical compound to the environment in quantities ______ a sign

游客2025-04-16  27
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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