<p>Hey all. I have an English question from the Red Book (PRactice test 1, number 57)</p>
<p>'But in pinball, you have three factors to consider: you, the machine, and chance, which is sometimes your ** enemy ** sometimes your ally. </p>
<ol>
<li>A. NO CHANGE
B. enemy,
C. enemy;
D. enemy, and,</li>
</ol>
<p>My initial answer was D; can somebody explain WHY the answer is B? </p>
<p>Thanks! :)</p>
<p>A comma after a conjunction like “and” indicates that what comes before and after it are independent clauses, or complete sentences.</p>
<p>“sometimes your ally” lacks a subject, so it is not an independent clause. Therefore, just a single comma with no conjunction is necessary.</p>
<p>I took that test too and B seemed kinda strange but this was my thought process. I was reading Barrons 36-which is a great book for learning everything-and I concluded that if it was D where the and was offset by commas, it would be a BTW which is a phrase that could be taken out without any affect on the sentence.</p>