问题
选择题
A survey of the opinions of experts___that three hours of outdoor exercise a week___good for one’s health.
A．show;are
B．shows;is
C．show;is
D．shows;are
答案
答案：B
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。