I was so angry to see the MP4 player I had had _____ a week before went wrong again.

A．it

B．it repaired

C．repaired

D．to be repaired

市政排水压力管道严密性试验，水压升至试验压力后，保持恒压（），检查接口、管身无破损及漏水现象时，管道强度试验为合格。