How long have you a member of Greener China. A. become B. been C. joined——青夏教育精英家教网—

摘要： How long have you a member of Greener China. A. become B. been C. joined

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“How long have you ________ Greener China?”

“ ________ the year before last.”

[　　]

A．joined, Since

B．joined, For

C．become a member of , Since

D．been a member of , Since

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