问题描述：
they know waht each other are doing
they each know waht other is doing；
they know what each is doing
they know waht they each are doing、这四句哪句是对的.解释说明错在那里
they each know waht other is doing；
they know what each is doing
they know waht they each are doing、这四句哪句是对的.解释说明错在那里
问题解答：
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