the safety of gas, the government has checked the city's gas supply system thoroughly.[ ]A. To ensure B. EnsuringC. Having ensured D. To have ensured-高中英语-n多题

◎ 题干

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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◎ 解析

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◎ 知识点

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