even if it()tomorrow

答案：rains
解释：even if = even though 表示“即使,尽管”,引导的是让步状语从句,并非条件状语从句.这里同样遵循“主将从现”原则,即：从句一般现在时,主句用一般将来时,这里不能用will rain.
句意：即使明天下雨,我们还是要去动物园.

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