We did not expect the plan we had made very carefully for them ______ so coldly.

A．refused

B．to refuse

C．to be refused

D．refusing

加气站可燃气体检测报警器每月按动报警器自检试验系统按钮（）次来检查指示系统运行状况。

A.1次

B.2次

C.3次

D.4次