Question

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

Answer 1

B

試題分析：for+一段時間，句子要用完成時態，并且句子的謂語動詞要有延續性。句意：男孩是如此傷心的因為他的可愛的寵物死了四天了。故選B.
點評：非延續性動詞向延續性動詞的轉變熟記一下幾個：
leave --- be away,  borrow --- keep,  buy --- have,  begin/start --- be on,      die --- be dead, leave --- be away from, fall asleep --- be asleep