将one-eight八个数字填入下图，使等式成立。A－B= C÷＋DE==F×G=HA___________ B___________C___________ D___________E___________ F___________G___________ H__________

◎ 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

◎ 答案

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◎ 解析

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◎ 知识点

根据魔方格专家分析，试题“将one-eight八个数字填入下图，使等式成立。A－B= C÷＋DE==F×G=HA___________ B___________C___________ D___________E___________ F___________G___________ H___________…”主要考查了你对【不定式】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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