题目内容
My sister is determined. ________ she has made up her mind, nothing can change it.
| A．Though | B．Once | C．Unless | D．Until |
B
解析试题分析：“一旦”下定决心，什么也不能改变（她的决心）。once: as soon as, when, 引导时间状语。A项引导让步状语从句；C项引导条件状语从句；D项引导时间状语从句，但是要求主句动词为延续性动词或动词的否定形式。故B项正确。
考点：状语从句。
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