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When comes to research into heart disease and the effects on the body,we do not

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When comes to research into heart disease and the effects on the body,we do not

When ____ comes to research into heart disease and the effects on the body,we do not have adequate substitutes for the use of animals.

A. that　 B. it C. what　 D. this

 

试题答案

B

标签：effectstheandwebody

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