Choose the best word or use of words for the blank space that fits the meaning of the sentence as a whole.

For centuries animals have been used as ____ for people in experiments to assess the effects of therapeutic and other agents that might later are used in humans.

Created: 5 months ago | Updated: 5 months ago
Updated: 5 months ago

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Past perfect continuous
Past perfect
Present perfect continuous
Present perfect
Created: 3 days ago | Updated: 3 days ago
Updated: 3 days ago
one who flirts with ladies
a person of narrow mind
a hater of mankind
who believes that God is everywhere.
Created: 3 days ago | Updated: 3 days ago
Updated: 3 days ago
Money makes money.
Money brings money.
Money begets money.
Money beings money.
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