--- Was Tom a member of Greener China?
---Yes, he has ___ Greener China for 5 years.
| A．taken in | B．joined | C．been in | D．been to |
--- Was Tom a member of Greener China?
---Yes, he has ___ Greener China for 5 years.
| A．taken in | B．joined | C．been in | D．been to |
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