单选题
We are unable to complete an earlier shipment, because there is no ship sailing to your port this week.
【正确答案】
A
【答案解析】[解析] 本题的关键在于正确把握句子结构和理解重点词汇。句子的主干为We are unable to complete an shipment。earlier为定语修饰shipment“装运,运输”,be unable to do sth.表示“无法做某事”,complete在此处作动词,意思为“结束,完成(目标)”;because引导原因状语从句,sailing是现在分词作后置定语修饰ship。