______ Joseph off at the airport, Sally finished her work earlier.[ ]A. Havin

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______ Joseph off at the airport, Sally finished her work earlier.[    ]
A. Having seen
B. Seen
C. To see
D. To be seen

答案

举一反三

______ the theory, the scientists asked more than sixty college students to take part in the experiment.[      ]
A. Being tested
B. To test
C. Testing
D. Tested

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In the morning you can get up only ________ all your equipment buried and you"ve got to dig it out.[     ]
A. to be found
B. found
C. to find
D. finding

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Some people try to knock me down, only ________ me more determined to do better.[     ]
A. to make
B. makes
C. having made
D. made

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It was ________ the old watch that the old man spent the whole afternoon at home.[    ]
A. in repair
B. repaired
C. to repair
D. repairing

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The government has taken measures air quality.[ ]
A．to improve
B．improved
C．being improved
D．to be improved

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