单选题 He failed the exam because none of his answers were ______ to the questions asked.
【正确答案】 A
【答案解析】[解析] 句意:他之所以考试失利是因为他总是答非所问。pertinent相关的,相干的,切题的。omniscient全知的,无所不知的。elusive难懂的,难捉摸的。