【题目】We have sometimes accidents on this line, but no accidents ______ since last winter. ( )
A.occurB.have occurredC.have been occurringD.are occurring
【答案】B
【解析】
句意：这条线路有时发生事故，但自去年冬天以来没有发生过意外。根据时间，自去年冬天以来可知用现在完成时。故选B。
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