The boy acted     （）       he had never lived in Canada before.

题目解析 题目：The boy acted （） he had never lived in Canada before. 选项：A.as though B.even if C.as D.since 答案：A 解析：该句是表示虚拟情况的用法。"as though" 是一个固定搭配，意思是"好像，仿佛"，用于表示假设或虚拟情况。在这个句子中，"The boy acted as though he had never lived in Canada before." 表示他表现得好像他之前从未在加拿大生活过。其他选项 "even if"（即使），"as"（因为），"since"（自从）都不符合句意。