This is the second time I ________ the Himalayas as a college student.[ ]A.

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This is the second time I ________ the Himalayas as a college student.[     ]
A. climb
B. had climbed
C. climbed
D. have climbed

答案

举一反三

The last few years ________ many disasters in and out of China, from earthquake to drought.[     ]
A. see
B. are seeing
C. have seen
D. saw

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—Hello, John, how are you? Are you busy now?
—Not really. I ________ my report. And now I am watching an American movie on TV.[     ]
A. finished
B. have finished
C. had finished
D. have been finishing

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Listening to loud music at rock concerts ________ caused hearing loss in some teenagers.[     ]
A. is
B. are
C. has
D. have

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Such great progress ________ that the teachers are pleased with him.[    ]
A. he has made
B. has he made
C. did he make
D. made he

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Every possible means ________ to prevent the air pollution, but the sky is still not clear. [     ]
A. is used
B. are used
C. has been used
D. have been used

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