2. 外语
  3. ______,heat is produced.

______,heat is produced.

admin2012-08-05  68
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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