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had been reinforcing

  • past perfect progressive
    of reinforce.
    reinforce
    verb (used with object)
    to strengthen with some added piece, support, or material.

Example Sentences

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See Examples For:

The U.S. official and Ukrainian commanders said the Russians had been reinforcing their front lines, including deploying recently mobilized reservists, in a bid to better protect the withdrawal.

From Reuters Nov. 4, 2022

Aid workers in Goma said the Congolese Army had been reinforcing its positions in the last few days with tanks, heavy artillery and allies from some very unscrupulous militias.

From New York Times Dec. 17, 2012