This computer doesn’t work properly because the operating system has.A. broken upB. broke

问题补充：

This computer doesn’t work properly, because the operating system has.

A. broken up

B. broken down

C. broken out

D. broken away

答案：

A. broken up

(答案→)B. broken down

C. broken out

D. broken away

解析：本题考查动词短语辨析。句意：因为操作系统出了故障。”breakdown“破坏；出故障”。