In the testing Dr. Aiken cut the background from those photos for the purpose of______.A.

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In the testing, Dr. Aiken cut the background from those photos for the purpose of______.

A.grouping those couples again

B.leaving no trace for the testees

C.imitating those couples" life

D.leaving the testees more chances

请帮忙给出正确答案和分析,谢谢!

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