The computer system _____suddenly while he was surfing the Internet. 
#69744
A
broke up
B
broke out
C
broke in
D
broke down
推荐题目
Her leg has been ______ for quite a while, which ,in the meawhile, makes_____for her parents.
#83544
A
troubling ; troubles
B
troubled; room
C
troubled; troubles
D
troublesome; trouble
She ______his number in her phone book to ______that she had got the right number. 
#74763
A
looked for , be certain
B
picked up , make sure
C
picked out , be sure
D
looked up, make sure