胶印机正式开机前应首先用手动盘车的方法运转机器，盘车时应（）。
A、用力盘动
B、先顺盘一二周
C、先倒盘一二周
参考答案：C
There are many people downstairs. What do you think ______?
A．to happen
B．happening
C．is happened
D．has happened
