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___the safety of the gas,the government has checked the city's gas supply system.
A.to ensure
B.ensuring
C.Having ensured
D.To have ensured
选哪个?
人气：225 ℃ 时间：2020-01-30 08:21:22
解答
A 不定式表示目的
请及时采纳,多谢!
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