B efficient adj.有效率的,（直接）生效的,能干的
D sufficent adj.足夠的,充足的；
因此D更符合語(yǔ)境.
翻譯：歐盟國(guó)家曾經(jīng)擔(dān)心他們得不到足夠的石油供應(yīng).
The European Union countries were once worried that they would not have ____ supplies of petroleum.
The European Union countries were once worried that they would not have ____ supplies of petroleum.
A) proficient B) efficient C) potential D) sufficient 為什么不能B 要選D
A) proficient B) efficient C) potential D) sufficient 為什么不能B 要選D
英語(yǔ)人氣：410 ℃時(shí)間：2020-06-05 04:34:13
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