标题: 一道语法题 [打印本页] 作者: Lois6669 时间: 2011-5-29 11:07 标题: 一道语法题 The major areas of medicine in which lasers are effective is in the cutting and closing of blood vessels, and in the destruction of tumors. (A) is in the cutting and closing of blood vessels, and in the destruction (B) are the cutting and closing of blood vessels, and also the case of destroying (C) are the cutting, closing of blood vessels, and in the destroying (D) are the cutting and closing of blood vessels, and the destruction (E) is in the cutting and closing of blood vessels, and the destroying