公安消防部队机关干部学习的基本制度包括（）。
A.集体学习制度
B.培训轮训制度
C.个人自学制度
D.课题调研制度
参考答案：A, B, C, D
— What beautiful flowers in the garden!
— Yeah! They ____ here last year. [ ]
A. planted
B. were planted
C. are planted
D. will be planted
