The boy is so sad because his lovely pet _____ for four days.A.has diedB.has been deadC.is dyingD.has dead
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B解析试题分析：for+一段时间，句子要用完成时态，并且句子的谓语动词要有延续性。句意：男孩是如此伤心的因为他的可爱的宠物死了四天了。故选B.考点：延续性动词和非延续性动词
点评：非延续性动词向延续性动词的转变熟记一下几个：leave --- be away, borrow --- keep, buy --- have, begin/start --- be on, die --- be dead, leave --- be away from, fall asleep --- be asleep