I called him many times, but I didn’t get through, maybe his mum _   on the phone all the time．

A．talked

B．was talking

C．has talked

D．had talked

记名股票的特点包括（）。

A．股东权利归属于记名股东

B．可以一次或分次缴纳出资

C．转让相对复杂或受限制

D．便于挂失，相对安全