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15、Left alone on that small island, he seemed to have to learn to survive _____.

A. from a teacher                      B. through trial and error 

C. without any effort           D. by scientific experiments

15、B

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Left alone on that small island, he seemed to have to learn to survive _____.

A. from a teacher                      B. through trial and error 

C. without any effort           D. by scientific experiments

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