China'sicebreakerXuelong 

问题详情：

China's icebreaker Xuelong  ______  by heavy floes since Friday after rescuing passengers on a Russian vessel stranded in Antarctica.

A. has been trapped                    B. had been trapped

C. has trapped                         D. was trapped

【回答】

A

知识点：现在完成时及其被动式

题型：选择题