问题
选择题
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
答案：B
本题考查动词短语辨析。句意：因为操作系统出了故障。”break down“破坏；出故障”。
搜题请搜索小程序“爱下问搜题”