爆破过程中的瓦斯检查由（）检查。
A·爆破工
B.瓦斯检查工
C.班组长
D.爆破工、瓦斯检查工、班组长
参考答案：D
I injured my legs while I on the playground yesterday. [ ]
A. ran
B. to run
C. was running
私募基金登记备案有何积极意义？
