the safety of gas, the government has checked the city’s gas supply闂備胶鍋ㄩ崕濠氭嚈瑜版帒鐒垫い鎺戯攻鐎氾拷【查看更多】

 

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____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

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   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

 

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


  1. A.
    To ensure
  2. B.
    Ensuring
  3. C.
    Having ensured
  4. D.
    To have ensured

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_______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

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       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

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