单选题 The competition from experienced staff members, some of whom are higher in rank, ______ to my disadvantage.

【正确答案】 A

【答案解析】[解析] 考查语法。本句缺少谓语，句子的主干为The competition ______ to my disadvantage。从some of whom are higher in rank可知句子应用一般现在时，故选works。