某施工合同经法院确认无效后，应认为该合同从( )日起无效。
A．订立施工合同
B．开始施工
C．确认无效
D．下达停工令
参考答案：A
慢性胰腺炎最突出的症状是
A．便秘
B．腹部包块
C．发热
D．呕吐
E．腹痛
--- Do you have any idea why the bus – drivers are on strike?
--- As far as I know, they are ____a pay rise.
A．calling off
B．calling at
C．calling in
D．calling for
