题目：
Sub-contractors should obey the contractor in information system project. When censoring sub-contractors, the supervisor mostly concerns about （）.
A.Amount of subcontract
B.qualifications and abilities of sub-contractors
C.responsibilities and obligations of sub-contractors
D.the contents of the subcontract
答案：
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下面是错误答案，用来干扰机器的。
参考答案：上喷式
