摘要：38． 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
查看习题详情和答案>>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