______,heat is produced.A、Certain chemicals are mixed togetherB、That certain ’c

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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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