___ the safety of gas, the government has checked the city's gas supply system thoroughly. [ ]A. Having ensured B. Ensuring C. To ensure D. 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. Having ensured
B. Ensuring
C. To ensure
D. Ensured

◎ 答案

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◎ 解析

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◎ 知识点

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