<ol>
<li>American journalist [Harriet Quimby, the first woman to pilot a plane across the English Channel], doing it just nine years after the Wright brothers' first powered flight.</li>
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<p>c. Harriet Quimby became the first woman to have piloted a plane across the English Channel and did it
d. Harriet Quimby became the first woman to have piloted a plane across the English Channel, accomplishing this feat</p>
<p>in d, why is "accomplishing" correct? I put down d, but as the best choice, but just because it "sounded good"</p>
<ol>
<li><p>[Until it ]can be replaced by a faster, more efficient, and more economical means of transportation, trucks will carry most of the freight within and through metropolitan areas.
Why is "until it" incorrect?</p></li>
<li><p>Nearly all of the editors of the magazine agree that of the two articles to be published, Fujimura's is the [more exciting].
Shouldn't it be "the more exciting one/magazine"? I read another CC'ers explanation of this (one/magazine is "implied", but "the" is an article, so shouldn't it automatically be followed by a noun?</p></li>
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<p>Thanks in advance :)</p>