脚手架剪刀撑的搭接长度不小于（）。
A、0.4m
B、0.5m
C、0.6m
D、1m
参考答案：D
When the manager came in，the workers pretended________hard on their machines.
A．to work
B．to be working
C．to have worked
D．working
职业定向
