混凝土坍落度试验时，坍落度筒的提离过程要求在( )内完成。
A．3～5s
B．5～8s
C．5～10s
D．8～12s
参考答案：C
I still remember _____ to the Famen Temple and what I saw there. [ ]
A. to take
B. to be taken
C. taking
D. being taken
简述操作步骤。
