— No one answered when I phoned this morning. Where were you?

— I         for teeth in the dental clinic.

A．was being treated

B．have been treated

C．was treated

D．treated

存托凭证业务中，托管银行所提供的服务包括(　　)。

A．领取红利或利息，用于再投资或汇回ADR发行国

B．负责ADR的注册和过户

C．负责保管ADR所代表的基础证券

D．负责对公司管理监督