The law requires government to increase investment in public transport,——services and encourageencourage people to ues public transport.A.improved B.to improve C.improving D.have improved

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The law requires government to increase investment in public transport,——services and encourageencourage people to ues public transport.A.improved B.to improve C.improving D.have improved
The law requires government to increase investment in public transport,——services and encourage
encourage people to ues public transport.
A.improved B.to improve C.improving D.have improved

The law requires government to increase investment in public transport,——services and encourageencourage people to ues public transport.A.improved B.to improve C.improving D.have improved
to improve 去改善

B,这里还是接的requires,所以是to improve