The machine has again; I think we’d better buy a new one.A. broken offB. broken upC. bro

问题补充：

The machine has again; I think we’d better buy a new one.

A. broken off

B. broken up

C. broken into

D. broken down

答案：

A. broken off

B. broken up

C. broken into

(答案→)D. broken down

解析：句意：机器再次发生故障了，我认为我们最好买台新的机器。Break off 停止 ；break up 破碎； break into 闯入 ； break down 出故障，选D。