问题
He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system ____.
A:broke in
B:broke up
C:broke out
D:broke down
B:broke up
C:broke out
D:broke down
正确答案是：
同类题型
fter a long riding, the passengers inthe bus were very tired and some of them ____ asleep.
He was afraid there was any wild animal around him, looking round from ________
They __ five Engglish classes a week last term
_______ are you staying there? –– For about two weeks.
for the breakdown of the school computer network,Alice was in low spirits.