---What ______ the forest of Yangzhou in the last 30 years?
---Yangzhou has become much greener.
| A．has happened to | B．was happened to |
| C．has happened at | D．is happening |
---What ______ the forest of Yangzhou in the last 30 years?
---Yangzhou has become much greener.
| A．has happened to | B．was happened to |
| C．has happened at | D．is happening |
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