SAT语法doing和bydoingMovingontoothertopics,theeditorsabandonedthedisputeinordertoaccomplishagreateramountofworkatthemeeting.请问为什么不是Bymovingontoothertopics请问moving的逻辑主语是谁,这里是分词还

　　SAT语法doing和bydoing

　　Movingontoothertopics,theeditorsabandonedthedisputeinordertoaccomplishagreateramountofworkatthemeeting.

　　请问为什么不是

　　Bymovingontoothertopics

　　请问moving的逻辑主语是谁,这里是分词还是动名词