1、_____ which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.

　　A. Leaving to wonder　B. Having left to wonder

　　C. Left wondering　　　　　D. Left to wonder

　　2、During the tourist season, there are many people wandering in this city to see the old castles _____ in the sixteenth century.

　　A. to be built　　B. being built

　　C. having been built　　D. built

　　3、Some 25,000 people were reported _____ in the ever recorded worst earthquake in Iran, which occurred late this month.

　　A. were killed　B. to be killed　C. killing　D. to have been killed

　参考答案&解析：

　　1、C　left wondering 中left的逻辑主语是the little boy，所以可转换成The little boy was left wondering… 。故答案为C。

　　2、D　非谓语动词的动作先于句中谓语动词的动作时，用过去分词。故答案为D。

　　3、D　当不定式所表示的动作先于谓语动词所表示的动作时，不定式用完成时，且kill与逻辑主语people之间是被动关系，故答案为D。