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

試題分析：考察時態(tài)。本題的關鍵是by到…時為止；該詞通常與完成時連用，本句后面的時間狀語是next summer,這是一個將來時的時間狀語，故本句使用將來完成時。句意：到今年夏天結束的時候，John將在這家工廠里工作了13年了。故B正確。
點評：連詞by到…時為止；該詞經(jīng)常與完成時連用，如果后面是現(xiàn)在的時間，句中就使用現(xiàn)在完成時；如果后面是過去的時間，就使用過去完成時；如果后面是將來的時間，就使用將來完成時。
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