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the safety of gas, the government has checked the city’s gas supply system thoro

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the safety of gas, the government has checked the city’s gas supply system thoro

　 the safety of gas, the government has checked the city’s gas supply system thoroughly.

　 A．To ensure　 B．Ensuring C．Having ensured.　 D．To have ensured

 

试题答案

A

标签：hasgovernmentcitycheckedsafety

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