the safety of gas, the government has checked the city’s gas supply system thoroughly.A. T

发布时间：2020-08-16 14:23:32

    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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(答案→)A. To ensure
B. Ensuring
C. Having ensured.
D. To have ensured
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