Jiaxing is a small city. Therefore, to ______ the flow of traffic, the government has decided to broaden some main streets.
| A．speed up | B．build up | C．put up | D．come up |
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Jiaxing is a small city. Therefore, to ______ the flow of traffic, the government has decided to broaden some main streets.
| A．speed up | B．build up | C．put up | D．come up |
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