When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
A.refers to | B.related to | C.comes to | D.talks to |
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When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
A.refers to | B.related to | C.comes to | D.talks to |