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。