—Mom, I want to be an engineer when I grow up. —Son, your dream will not come true _____ you keep trying your best.

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1. (2019九上·玉林期末) —Mom, I want to be an engineer when I grow up.
—Son, your dream will not come true _____ you keep trying your best.

A . when B . whether C . unless D . because

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使用过本题的试卷

广西玉林市2020届九年级上学期英语期末模拟考试试卷I（含听力音频）