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By next summer John _____in this factory for thirteen years.
A.has been workingB.will have been working
C.will be workingD.has worked
B

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。
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