---______ do you exercise? ---Once a week.
#60191
A
How long
B
How often
C
How many
D
How old
推荐题目
As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?
#64802
A
do they
B
don’t they
C
don’t you
D
isn’t it
—Is Lingling’s father from England? — . He is Chinese.
#60056
A
Yes, he is
B
No, she isn’t
C
Yes, she is
D
No, he isn’t
It is impossible that you achieve your goal without effort, ?
#64824
A
don’t you
B
is it
C
isn’t it
D
do you