Tom is so independent that he never asks his parents’ opinions________he needs their help.

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问题 Tom is so independent that he never asks his parents’ opinions________he needs their help.

选项 A、since
B、once
C、after
D、unless

答案D

解析 since:自……以来,因为,引导时间和原因状语从句;once:一……就……,引导时间状语从句;after:在……以后,引导时间状语从句;unless:除非,引导条件状语从句。根据句意并分析句子结构可知,选D。
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本试题收录于: 英语题库普高专升本分类
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