2.According to new scientific assessments,two thirds of carbon dioxide ____ from the United States and Western European countries.( )
A. | have come | B. | has come | C. | having come | D. | coming |
1.The thought of changing the material eventually let to ____.( )
A. | the new element having separated | |
B. | separate the new element | |
C. | the new element being separated | |
D. | the new element to be separated |
20.The government ____ to restore the building to its ____ state,but failed.( )
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A. | made an attempt…originally | B. | made an attempt…original | ||
C. | had an attempt…originally | D. | had an attempt…original |