______,heat is produced.

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问题 ______,heat is produced.

选项 A、Certain chemicals are mixed together
B、That certain ’chemicals are mixed together
C、Whenever certain chemicals are mixed together
D、The mixing together of certain chemicals

答案C

解析状语从句。此处考查句子之间的衔接关系，只能使用状语从句，所以正确选项为C。

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专业英语四级

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______,heat is produced.

专业英语四级

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