global energy safety, all the countries have been called on to take joint efforts ．A. Hav

发布时间：2020-08-15 01:05:33

     global energy safety, all the countries have been called on to take joint efforts ．
A. Having ensured
B. Ensuring
C. To ensure
D. To have ensured

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A. Having ensured
B. Ensuring
(答案→)C. To ensure
D. To have ensured
解析：不定式短语作目的状语，“为了确保……”。
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