单项选择题
Dr. Hooper at Michigan United Hospital is the world's______authority on knee replacement surgeries.（）
A．ledB．leaderC．leadingD．leaders
单项选择题 Althea Corporation______by many analysts to be the most innovative software company in the industry.（）
单项选择题 It is still unclear______the Mayor will accept the recommendations of the City Council.（）
单项选择题 Salpert Corporation’s stock______by 8% during the first quarter of the year.（）
