【题目】Helen didn’t mention anything about the dinner over the phone; she seemed about our appointment.
A. to have forgotten B. to forget
C. having forgotten D. forgetting
在线课程【答案】A
【解析】考查非谓语动词。句意：海伦在电话里没提吃饭的事；她似乎已经忘记了我们的约定。根据sb. seem to do sth.可选A、B；再根据didn’t mention可知，forget动作已经发生，故用不定式的完成形式。