When ______ comes to research into heart disease and its effects on the body, we do not have ad...
When______comestoresearchintoheartdiseaseanditseffectsonthebody,wedonothaveadequatesu...
When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals. A．that B．it C．this D．what
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| B |
| 考查固定句型：when it comes to“当涉及…的时候”，句意是：当涉及研究心脏病和它对身体的影响时，我们不会有适当的代用品来代替动物。选B。 |
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