The key______ the problem of traffic jams is to pay the “ congestion charge” ______ by the mayor of London.
A.to solving; introducing |
B.to solve; introducing |
C.to solving; introduced |
D.to solve; introduced |
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The key______ the problem of traffic jams is to pay the “ congestion charge” ______ by the mayor of London.
A.to solving; introducing |
B.to solve; introducing |
C.to solving; introduced |
D.to solve; introduced |