China'sicebreakerXuelong
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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
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