问题描述：
What most parents are concerned about is.语法
请问为什么这句话中要加个are,不能说What most parents concerned about is.
如果换care about ,前头要不要加个are?
请问为什么这句话中要加个are,不能说What most parents concerned about is.
如果换care about ,前头要不要加个are?
问题解答：
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