A survey of the opinions of expertsthat three hours of outdoor exercise a weekgood for one

问题补充：

A survey of the opinions of expertsthat three hours of outdoor exercise a weekgood for one’s health.

A. show;are

B. shows;is

C. show;is

D. shows;are

答案：

A. show;are

(答案→)B. shows;is

C. show;is

D. shows;are

解析：主语A survey of the opinions of experts表示单数，所以要用shows。three hours of outdoor exercise a week表示时间，所以也表示单数，要用is。