I know I didn’t forget ________ my camera with me because I clearly remember ________ it in my bag.

A．taking; to put

B．to take; to put

C．to have taken; putting

D．to take; putting

衡量国家发展水平的重要标志是[ ]

A、城市人口所占比例

B、人口死亡率

C、人口出生率

D、人口自然增长率