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 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 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 decided who to go.A、if he leaves B、if he'll leave 为什么?
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.

A
if的从句中，一般主句用将来时，从句用一般现在时

B
根据题意选择