To read of Abigail Adams’ lengthy separation from her family, her difficult travels, and her constant battles with illness is to feel intensely how harsh life was even for the so-called aristocracy of Revolutionary times.
To read of
Reading about
Having read about
Once one reads of
To have read of
Choice A is correct because the sentence must begin with a verb form that completes the construction To… is to feel. Each of the other choices breaks the parallelism in some way,
B and C substitute about for of, the preferred preposition here.
E begins with To, but have read creates a disjunction of tenses by placing the action of reading in the past while to feel is still in the present. The question is of middle difficulty
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