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

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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