【To ensure】 the safety of the gas,the government has checked the city's gas supply system.
為了保證煤氣的安全,政府已經(jīng)檢查了該城市的煤氣供應(yīng)系統(tǒng).
選 A,不定式的普通形式,表示目的
D 是不定式的完成式,表示已經(jīng)完成的事,沒(méi)有表示目的的意思.
___the safety of the gas,the government has checked the city's gas supply system.
___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
.為什么不選D
A.to ensure
B.ensuring
C.Having ensured
D.To have ensured
.為什么不選D
英語(yǔ)人氣：295 ℃時(shí)間：2020-01-31 06:39:20
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