Learning from past failures, researchers realized the importance ofA．putting some inexpens

Learning from past failures, researchers realized the importance of

A．putting some inexpensive sensors in stoves.

B．focusing on how stoves are actually used.

C．cooperating with mobile-phone companies.

D．possessing laboratory data about how stoves work.

请帮忙给出正确答案和分析，谢谢！

参考答案

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