一（2014安徽卷）30．People are recycling many things which they away in the past.
A. had thrown B. will be throwing
C. were throwing D. would have thrown
【解析】句义：人们作者回收利用他们过去常常会扔掉的东西。Would have done过去常常做某事；是对过去发生的事情的推测。如果不适应情态动词，可以使用一般过去时threw。故D正确。
【举一反三】I ______ sooner but I didn’t know that they were waiting for me.
A. had come B. was coming C. would come D. would have come
【解析】句意为“我本来可以早点来，但我真不知道他们在等我。”but I didn’t know表示了过去时间，因此前句是对过去的虚拟，用主语+should / would / could / might + have done表达，故选D。
二（2014北京卷）27. ________ I have a word with you? It won’t take long.
C. Shall B. Must D. Should
【解析】本题考察的是情态动词基本意义辨析。Can能够，可能；must必须，一定；非得；shall将要；should应该；句意：我可以和你谈谈吗？不会花很多时间的。根据句意可知本题使用can I…？表示询问对方是否允许。如：Can I use your dictionary?我可以使用你的字典吗？故A正确。
三（2014北京卷）34. We __________ back in the hotel now if you didn’t lose the map.
B. were D. would be C. will be