【详细解答】 terminate终止,结束:The contract can be terminated by either party.任何一方都可终止契约合同。B. expire期满,终止:The trade agreement between the two countries will expire next year.这两国间的贸易协定明年期满。expire指某一期限何时到期,结束,因此同unexpectedly搭配不合适。C. fulfil完成,结束。D. accomplish达到,完成。