房地产估价机构按照注册房地产估价师数量、经营业绩和注册资本等条件，资质等级分为( )类。
A．3
B．4
C．5
D．2
参考答案：A
质量力
Only after my friend came ____.[ ]
A. did the computer repair
B. he repaired the computer
C. was the computer repaired
D. the computer was repaired
