Over the past decades, sea ice in the Arctic as a result of global warming.A
题型：不详难度：来源：
Over the past decades, sea ice in the Arctic as a result of global warming.| A．had decreased | B．decreased | C．has been decreasing | D．is decreasing |
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答案
| C。 |
解析
| 考查时态。句中有Over the past decades谓语动词用现在完成时或现在完成进行时。 |
举一反三
-----Did you watch the basketball match yesterday?
-----Yes, I did. You know, my brother ________ in the match.| A．is playing | B．was playing | C．has played | D．had played |
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—Did you see a man in black pass by just now?
—No, sir. I ________ a newspaper. | A．read | B．was reading | C．would read | D． am reading |
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I like these English songs and they ________many times on the radio.| A．taught | B．have taught | C．are taught | D．have been taught |
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So far this year we ______ a fall in house prices by between 5 and 10 percent.| A．saw | B．see | C．had seen | D．have seen |
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—Have you known Dr. Jackson for a long time?
—Yes, since she________ the Chinese Society.| A．has joined | B．joins | C．had joined | D．joined |
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