When the old man _______ to walk back to his house, the sun ________ itself behi
题型：不详难度：来源：
When the old man _______ to walk back to his house, the sun ________ itself behind the mountain.| A．started; had already hidden | B．had started; had already hidden | | C．had started; was hiding | D．was starting; hid |
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答案
| A |
解析
| 老人开始跑回家与太阳落山两个动作都发生在过去，而后者又发生在前者之前，故前者用一般过去时，后者用过去完成时。 |
举一反三
I __________ there little more than a week when I set to work with the scientist. | A．would be | B．have been | | C．had been | D．will be |
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When I was a little child, Father told me the earth ___ round then sun.| A．turn | B．turned | C．is turned | D．turns |
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Our teacher taught us that water ___ at zero degree centigtade.| A．freezes | B．freeze | C．freezed | D．is freezed |
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He ___ Beijing for a long time.| A．has been away | B．has left | C．has been away from | D．left |
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I ___ a Leaguage member for six years.| A．become | B．have become | C．came | D．have been |
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