问题描述：
英语完形填空的分析
a father left his wife safely at home and rushed to the school where his son was supposed to be,only (to discover) that the building was as flat as pancake.
括号里的为什么填动词的不定式?only 这是什么句型?
原来的选项是：
A、discovered B\discovering C\to discover D\haveing discovered
a father left his wife safely at home and rushed to the school where his son was supposed to be,only (to discover) that the building was as flat as pancake.
括号里的为什么填动词的不定式?only 这是什么句型?
原来的选项是：
A、discovered B\discovering C\to discover D\haveing discovered
问题解答：
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