---You look very healthy. ________do you exercise? -----I exercise three times a week. 
#56267
A
How often
B
How many
C
How much
D
How soon
推荐题目
In this school, ______ students work very hard, ______ they are very happy.
#57207
A
although, /
B
although, but
C
/, although
D
but, although