With the effects of global warming, trees their leaves much later in th
题型：不详难度：来源：
With the effects of global warming, trees their leaves much later in the year.| A．are losing | B．have lost | C．lost | D．were losing |
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答案
| A |
解析
| 考查时态，指现阶段一直进行的动作用现在进行时态。句意：随着全球变暖的影响，在一年中一些树失去树叶比以前晚多了。故选A。 |
举一反三
---Do you still smoke heavily?
--- No. In fact, it is two years since I ____.
A. have stopped smoking B. smoked
D. began to smoke D. started to smoke |
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If he _______, don’t interrupt him.| A．still works | B．is still working | | C．still had been working | D．will still be working |
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Ladies and gentlemen, please fasten your seat belts. The plane _____.| A．takes off | B．has taken off | C．took off | D．is taking off. |
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---- Yes, but he ____ here for only two days before his company sent him to Australia.| A．stayed | B．has stayed | C．will stay | D．was staying |
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