题目内容
The boy is so sad because his lovely pet _____ for four days.
| A．has died | B．has been dead | C．is dying | D．has dead |
B
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.
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
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