SPRINGFIELD — Carolyn E. Shapiro was 9½ minutes into her argument before an Illinois Supreme Court justice uttered the first question. By the time oral arguments ended, she had faced 15 more. Her opposing counsel, Gino L. DiVito, was asked just two. The imbalance came Wednesday in the much-anticipated oral arguments over a 2013 state public pension reform plan that seeks to alleviate the more than $100 billion in unfunded liability by altering current workers’ benefits. The first inquiry of …