Question

9. It took me a long time before I was able to fully appreciate what they for me.

   A. had done   B. did

   C. would do   D. were doing

Answer 1

9. A

9. A解析:句意:很久以后我才能够完, 领会到他们为我做的一切。before表示 “在……以前”，在具体语境中可以根据 句子意思翻译为“……以后才……”。 此空用过去完成时是因为其动作发生在 was able to fully appreciate 这一过去的动 作的前面。