【題目】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:這條線路有時發(fā)生事故,但自去年冬天以來沒有發(fā)生過意外。根據(jù)時間,自去年冬天以來可知用現(xiàn)在完成時。故選B。

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