. 어법상 옳은 것은?① The elite campus-based programs which he will be taking it next semester are scheduled to be extremely difficult.② That happens in a particular period does not have any significant effects on the long-term investors in the stock market.③ The newly built conference room, though equipped with more advanced facilities, accommodates fewer people than the old one.④ With such a diverse variety of economical appliances to choose from, it's important to decide what it is best.