If the struggle for a sustainable society______, we must have some vision of wha

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问题 If the struggle for a sustainable society______, we must have some vision of what we are aiming for.

选项 A、is to succeed
B、has succeeded
C、succeeds
D、succeeded

答案 D

解析由have some vision of…可以看出句中说的还未成为现实，所以根据时态可以判断出本题的正确答案为D。空格处的意思是：如果斗争成功。

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