28．It is three months since father_____, I____ in France now had it not been for his illness.

A．was; would have been studying　

B．had fallen; would study

C．has been; would have studied　

D．fell; would be studying

隔离开关出厂验收标准卡项目有（）。

A.隔离开关外观验收

B.隔离开关试验验收

C.隔离开关装配验收

D.隔离开关安装验收