问题：
[单选题]架子队主要组成人员应由（）担任，应具有相应的作业技能，并经过岗位培训合格后方可持证上岗。
A、施工企业正式职工
B、劳务企业负责人
C、劳务作业人员
D、以上都可以担任
参考答案：
A
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