[-A2] ______ is a good form of exercise for both young and old.A.The walking B.Walking C.To walkD.Walk翻译并分析

[-A2] ______ is a good form of exercise for both young and old.A.The walking B.Walking C.To walkD.Walk翻译并分析
[-A2] ______ is a good form of exercise for both young and old.
A.The walking
B.Walking
C.To walk
D.Walk
翻译并分析

[-A2] ______ is a good form of exercise for both young and old.A.The walking B.Walking C.To walkD.Walk翻译并分析
步行对于老人和年轻人都是一种很好的锻炼方式
这里面is前面要加名词作主语,Walking 是动名词作主语

B 动名词作主语

同一楼

B 动名词作主语，谓语动词单数is