题目内容
________ 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
C
解析:
不定式短语作目的状语,“为了确保……”。
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题目内容
________ 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
C
不定式短语作目的状语,“为了确保……”。