After a dozen years of devoted work it suddenly drops dead, whereupon its master tips it into the ditch and the village dogs have torn its guts out before it is cold.
句意：为主人拼命干上十几年活后，它便猝然倒地死去，这时，主人便把它扔进沟里，尸体未寒， 其五脏六腑便被村狗扒出来吃掉。drop倒下；倒地。descend下来；下降。fall跌倒；落下。B选项与划线处意义最为接近，故选B。