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问题: 是英语高手的请进,有一道词汇题麻烦帮忙解答一下,本人不胜感激

The capital intended to broaden the export base and _____ efficiency gains from international trade was channeled instead into uneconomic import substitution.
A. secure B. extend C. defend D. possess
正确答案是选A,可我不明白secure在这里是什么意思,也是保护吗?

解答:

secure在这里是“确保”的意思