题目内容：
We have sometimes accidents on this line, but no accident______since last winter.(本题1.0分)A、 has been occured
B、 has occurred
C、 has been occurring
D、 is occurring
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选择题：We have sometimes accidents on this line, but no a
- 题目分类：河北工业大学-会计学-英语3(专升本)
- 题目类型：选择题
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A、 has been occured
B、 has occurred
C、 has been occurring
D、 is occurring