the safety of gas, the government has checked the city’s gas supply system thoroughly. A．To ensure ...
2023-01-19 11:46:03 106次 2010-2011学年广东省高三9月月考英语卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
the safety of gas, the government has checked the city’s gas supply
system thoroughly.
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A．To ensure
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B．Ensuring
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C．Having ensured.
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D．To have ensured
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