The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ________ out to sea.

A．to be staring

B．stared

C．having stared

D．staring

在报关单中，()与海关统计项目直接有关。

A.“经营单位”栏、“境内目的地”栏

B.“贸易方式”栏、“运输方式”栏

C.“原产国(地区)”栏、“起运国(地区)”栏

D.“征免性质”栏、“征免”栏