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13 votes
13 votes
He has been very interested in doing research on _______ since he was at high school.

a.biology b. biological c. biologist d. biologically

User Ericsoco
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1 Answer

5 votes
5 votes

Answer:

biology

Step-by-step explanation:

This is because research is made on a subject which should basically be a noun but since there's on article before the missing word therefore the noun biology suits best

User SonalKhodiyar
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