-- What bad luck that we______ the football match in the last 3 minutes.

--And we_______ hard in the last 3 years!

A．had lost; trained

B．were losing; had trained

C．have lost; have trained

D．lost; have been training

防止吊笼因机械、电气或其他故障造成超速下落或发生坠落的安全装置是（）。

A、防坠安全器

B、超高限位装置

C、超低限位装置

D、断绳保护装置