I don't know [ ] this evening.答案为什么选a?a.if he will be freeb.whether he is freec.when he is freed.when is he free

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I don't know [ ] this evening.答案为什么选a?a.if he will be freeb.whether he is freec.when he is freed.when is he free
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I don't know [ ] this evening.答案为什么选a?a.if he will be freeb.whether he is freec.when he is freed.when is he free
I don't know [ ] this evening.答案为什么选a?
a.if he will be free
b.whether he is free
c.when he is free
d.when is he free

I don't know [ ] this evening.答案为什么选a?a.if he will be freeb.whether he is freec.when he is freed.when is he free
当if/whether引导条件状语从句时,用一般现在时表将来,当when引导时间状语从句时,用一般现在时表将来；但用if/whether/when 引导宾语从句时,直接用一般将来时.
本句主语I,谓语don't know ,空格处应填宾语,即本句使用if/whether/when 引导宾语从句,this evening为时间状语,所以宾语从句应该用一般将来时.故空格处可填：if/whether/when he will be free.
答案A

句子意思是，我不知道他是否会有空这个晚上。
所以cd去掉。而whether在这里不可以用。所以a

c.when he is free

因为this evening是将来时，且这里的 if 表“是否”，并非“如果”，不受条件状语从句主将从现的约束，答案里应该有he will ，所以选a。

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