题目内容
20．A Russian plane broke up in the air，_____ all 224 people on board which was believed _______ by a bomb planted by Islamic State．（ ）| A． | killing； to have been caused | |
| B． | having killing； to have been caused | |
| C． | killing； to be caused | |
| D． | having killed； to have caused |
分析 一架俄罗斯飞机在空中解体，造成机上224人全部遇难．人们相信这是由伊斯兰国家有预谋的炸弹袭击导致的．
解答 答案：A 本题考查现在分词的用法．现在分词表示主动进行的动作，分为简单式（表达与谓语同时或几乎同时发生的动作）和完成式（表达在谓语动词之前就已经完成的动作）．题干中，kill的动作发生在broke up之后，要用现在分词的简单式；不等式的简单式表示没有发生的动作，不等式的完成式表达已经发生的动作．cause的动作已经发生，故选A．
点评 本题考查了非谓语动词中的现在分词和动词不等式．现在分词和动词不等式都简单式和完成式，表达不同时间发生的动作．学习时要注意区分和掌握．
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| 2．A．level | B．environment | C．condition | D．supply |
| 3．A．flying | B．blowing | C．flowing | D．floating |
| 4．A．requirement | B．demand | C．desire | D．price |
| 5．A．usually | B．obviously | C．suddenly | D．unavoidably |
| 6．A．combination | B．friend | C．effect | D．cause |
| 7．A．fallen | B．increased | C．raised | D．decreased |
| 8．A．persuading | B．hoping | C．offering | D．driving |
| 9．A．opinions | B．problems | C．decisions | D．methods |
| 10．A．fresh | B．good | C．safe | D．sweet |
| 11．A．conflict | B．meeting | C．concern | D．debate |
| 12．A．help | B．affect | C．increase | D．worsen |
| 13．A．key | B．means | C．evidence | D．answer |
| 14．A．build | B．find | C．prepare | D．provide |
| 15．A．rich | B．interested | C．abundant | D．poor |
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