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

 答案及解析：

1. C。left wondering 中left的邏輯主語是the little boy，所以可轉(zhuǎn)換成The little boy was left wondering… 。故答案為C。

2. D。非謂語動(dòng)詞的動(dòng)作先于句中謂語動(dòng)詞的動(dòng)作時(shí)，用過去分詞。故答案為D。

3. D。當(dāng)不定式所表示的動(dòng)作先于謂語動(dòng)詞所表示的動(dòng)作時(shí)，不定式用完成時(shí)，且kill與邏輯主語people之間是被動(dòng)關(guān)系，故答案為D。