______ (当涉及对心脏病及其对身体的影响的研究时), we do not have adequate substitutes for the use of

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问题 ______ (当涉及对心脏病及其对身体的影响的研究时), we do not have adequate substitutes for the use of animals.

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答案 When it comes to researches into heart disease and its effects on the body

解析本题测试句式when it comes to... 和后面几个词语research into，effects on的用法。

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