单选题 Keys should never be hidden around the house since thieves ______ know where to look.
A. virtually B. initially C. invariably D. infinitely

【正确答案】 C

【答案解析】[解析] 本题空格处是说贼总是知道在哪找到钥匙。C项invariably“不变地，总是”符合题意，如：All things invariably divide into two．事物都是一分为二的。其他二项virtually“事实亡，实质上”：initially“最初，开头”：infinitely“无限地，无穷地”都不正确。