— __________ when has the country been open to international trade?— 1978, I su
题型：不详难度：来源：
— __________ when has the country been open to international trade?
— 1978, I suppose. |
答案
| A |
解析
A。根据句中的现在完成时态可知，此题填since最佳。Since when的意思是“从什么时候开始”，又如：Since when have you lived here?你从什么时候起住在这里的? |
举一反三
Some students often listen to music __________ classes to refresh themselves. | A．between | B．among | | C．over | D．during |
|
__________ fire, all exits must be kept clear. | A．In place of | B．Instead of | | C．In case of | D．In spite of |
|
The open-air celebration has been put off __________ the bad weather.| A．in case of | B．in spite of | | C．instead of | D．because of |
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| Fred entered without knocking and, very out of breath, sank _________ a chair. |
| If you really have to leave during the meeting, you’d better leave _________ the back door. |
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