--- ____ have you been a member of Greener China?--- For two years.
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A
How often
B
How long
C
When
D
How far
推荐题目
The teachers’desk is __________________ the classroom. 
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A
behind
B
in front
C
in front of
D
in the front of
 — ______ do you go to the gym?— Twice a week
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A
How often
B
How soon
C
How many
D
How long
I'd like to go to the ________ to get some money.
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A
bank
B
bookshop
C
palace
D
museum