He spoke with Clare,        the telephone rang three times.

A．to which

B．during which

C．on which

D．for which

基坑开挖遵循（）的原则。

A、竖向分层、纵向分段、快速封底

B、竖向分层、水平分段、快速封底

C、横向分层、纵向分段、快速封底

D、竖向分层、纵向分段、快速封顶