Though the United States Navy maintains one of the largest fleets in the world, with craft stationed across the globe, they rarely deploy more than half of all available ships at any given time.
A.they rarely deploy
B.they have rarely deployed
C.rarely it has deployed
D.it rarely deploys
E.it is rarely deploying
Why D is correct ?Is the placement of "rarely" right? i think" rarely "is adverb,so it should be placed after verbs. Am i understand wrong?
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