房屋拆迁管理部门不得作为拆迁人，也不得接受拆迁委托。
参考答案：对
— I can't believe it! I only got a B on my project.
— That's not a bad grade.
— But I _____ on it for weeks. [ ]
A. am working
B. have worked
C. work
D. worked
在对阿富汗塔利班的战斗中，美军动用了大量特种部队，请说出3个。
