That, in turn, came amid an outbreak of restiveness among the developers who provide software to Apple users, and at whom the WWDC is ostensibly aimed.
一个是who引导的限定性定语从句,at whom引导的是非限吗?
限制性定语从句和非限制性定语从句不可能用and连接。二个都是限制性定语。
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