_____is a good of exercise for both the young and the old.
#98386
A
The walk
B
Walking
C
To walk
D
Walk
推荐题目
 _______ on time, this medicine will be quite effective. 
#98430
A
Taking
B
Being taken
C
Taken
D
Having taken
The two old sisters,_______ so long,held each other and burst into tears.
#98165
A
being separated
B
having been separated
C
having separated
D
had been separated