---What ______ the forest of Yangzhou in
题型:选择题
问题:
---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