“Was” is the helping verb
“Taking” is the main verb
A recent poll of 91 historians of US presidents gave a rating of the top 44 presidents who have alternately ruled the United States from George Washington to Barack Obama.
This is a ranking of the five best presidents of the United States of America, according to the opinion of the historians participating in the poll:
1st place: Abraham Lincoln (1865-1861)
Answer: I believe it would be letter (b)
Explanation: I had to answer this question yesterday and I am pretty sure this is the answer. Because it asks ¨the narrator gives an example of why oxygen is vital to climbers on Mt. Everest. How does the narrator develop this concept in the rest of the narrative?¨ so this is really the only plausible answer regarding the question.
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