By next summer John _____in this factory for thirteen years.A．has been workingB．
题型：不详难度：来源：
By next summer John _____in this factory for thirteen years.| A．has been working | B．will have been working | | C．will be working | D．has worked |
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答案
| B |
解析
试题分析：考察时态。本题的关键是by到…时为止；该词通常与完成时连用，本句后面的时间状语是next summer,这是一个将来时的时间状语，故本句使用将来完成时。句意：到今年夏天结束的时候，John将在这家工厂里工作了13年了。故B正确。
点评：连词by到…时为止；该词经常与完成时连用，如果后面是现在的时间，句中就使用现在完成时；如果后面是过去的时间，就使用过去完成时；如果后面是将来的时间，就使用将来完成时。 |
举一反三
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