问题描述：
助动词和情态动词改错问题4
Had Aristole asked his wife to keep her mouth open while he counted her teeth,he (could avoid) the mistake of thinking that women have fewer teeth than men.
括号里的是错的,可是为什么应该改成have avoided呢?
Had Aristole asked his wife to keep her mouth open while he counted her teeth,he (could avoid) the mistake of thinking that women have fewer teeth than men.
括号里的是错的,可是为什么应该改成have avoided呢?
问题解答：
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