The company identified nine new postures we had never seen before, all of which are driven by this new breed of devices.我知道all of which（非限制性定語從句）不能改成all of them,但不知原因。若非要改成all of them的話，好像就要把逗號改為分號，或者在逗號后加連詞and,再或者是逗號改為句號。這樣認為正確嗎？ 連詞和標點符號怎么用？尤其是逗號，分號，句號和連詞。請老師一定為學生解惑，謝謝您。
主題：：
：2013/3/27 16:38:47
The company identified nine new postures we had never seen before, all of which are driven by this new breed of devices.我知道all of which（非限制性定語從句）不能改成all of them,但不知原因。若非要改成all of them的話，好像就要把逗號改為分號，或者在逗號后加連詞and,再或者是逗號改為句號。這樣認為正確嗎？
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