Question

______the room, a letter was seen lying on the desk. A．Entering B．Entered C．After enterin

______the room, a letter was seen lying on the desk. A．Entering B．Entered C．After entering D．When he entered

Answer 1

D

考查非谓语动词。题中a letter与前面的分句不是同一个主语，所以前面应加上适当的主语，故选D。