Scientists have been trying to______what factors can cause aging.A、find outB、tu

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问题 Scientists have been trying to______what factors can cause aging.

选项 A、find out
B、turn out
C、set out
D、carry out

答案 A

解析该句意为：科学家一直在努力研究导致衰老的因素。find out：查明，发现，了解(about)，弄清楚(与find的区别在于常接疑问词引导的从句，并不是强调“结果”)；turn out：后来发现，生产；set out：出发，着手，布局，陈述；carry out：执行，落实，履行，进行

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