The first use of atomic weapons was in 1945.And their power _______ increased en
题型：不详难度：来源：
The first use of atomic weapons was in 1945.And their power _______ increased enormously ever since.| A．is | B．was | | C．has been | D．had been |
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答案
| C |
解析
| 此题考查时态的用法。前面讲1945年首次使用原子弹，而后面一句无确定的过去时间，但ever since确定了应选C项，因为ever since和完成时态连用,指的是“从那以后”，即since 1945。 |
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