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Thekey 

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问题详情:

Thekey 

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

【回答】

C 

知识点:介词

题型:选择题

标签:Thekey