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Addition of any chemical compound to the environment in quantities ______ a significant fraction of the total content of gasolin
Addition of any chemical compound to the environment in quantities ______ a significant fraction of the total content of gasolin
admin
2013-11-29
61
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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