Fill in the blank with the correct word.Both France and Germany _______ fought wars in the twentieth century.

The correct word to fill in the blank is "have."

So, the complete sentence would be: "Both France and Germany have fought wars in the twentieth century."

This construction emphasizes the action's relevance to the present, indicating that their involvement in wars is part of their historical legacy and still affects their current status. The use of the present perfect tense "have fought" illustrates that the actions occurred at some indefinite time in the past, and the effects of those wars continue to resonate in today’s political and social dynamics in Europe. In summary, the chosen word underscores the ongoing implications of historical conflicts between these two influential European nations.