I don't know _______ Gina will go to the zoo tomorrow.She is

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I don't know _______ Gina will go to the zoo tomorrow.She is busy these days.
A if B unless C though D how
Though Mike lived far from his school,_____ he never got there late.
A but B if C so D yet

个人觉得楼上解释不到位.
1.A
翻译：我不知道吉娜明天是否会去公园.这些天她很忙.
if的意思是“如果”,在句中引导know的宾语（从句）.
如果选BC,则主句I don't know中缺少宾语,因为它们都引导的是状语从句,而不是宾语从句.
D句意不通：我不知道吉娜明天会怎么样去公园.这些天她很忙.
2.D
英语中复合句的连词只能用一个（比如because和so不能连用等）,所以可以直接排出ABC,因为它们都是连词.
只要答案D yet可做副词,意思是“然而/但是”.

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