Potential energy that is not so obvious as kenetic energy exists in many things.句中定语从句兼具下面哪种状语功能?

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Potential energy that is not so obvious as kenetic energy exists in many things.句中定语从句兼具下面哪种状语功能?

A.原因

B.让步

C.条件

D.时间

参考答案:

答案:让步