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David doesn't know _for Guagnhzou,because the boss hasn't de

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David doesn't know _for Guagnhzou,because the boss hasn't decided who to go.
A、if he leaves B、if he'll leave 为什么?
David doesn't know _for Guagnhzou,because the boss hasn't de
应选A这是 know 后加 if 引导的宾语从句,if 应翻译成“是否”,而宾语从句的其中一项考点是 “时态一致”,应和前面的一般现在时(David doesn't know) 保持一致.如选 B 的话,if 应翻译成“如果”,语义不通.