劳务分包商必须具备相应的专业资质条件，其自身的人员数量及素质应能满足安全施工和（）的要求
参考答案：保证工程质量
—________does your father paly tennis after work?
—Every Tuesday and Thursday.
A.How often B.How soon C.How long
You must be tired now. Why not __________ a rest?[ ]
A. to stop to have
B. to stop having
C. stop to have
D. stop having
