<p>thanks for the information quantmech! I think it’s just the practice tests I’ve been using (save the blue book for last). Another mistake I saw was when a sentence error was “liable to err” and liable had to be changed to likely. In reality, liable can also mean “likely to do or be something” rather than the common usage of required by law.</p>
<p>I’m glad that despite the weird diction, the answer was actually correct. it’s one of those things that can be strict in grammar, but is usually ignored ( I remember reading something about only using however as a conjunction).</p>