There were all so tired that they could A do nothing but sleep B do nothing but to sleep为什么选A而不选B呢?
问题描述:
There were all so tired that they could A do nothing but sleep B do nothing but to sleep
为什么选A而不选B呢?
答
but 前后是并列成分 do与sleep是并列成分
答
could接不带to动词原形.
答
这是一个句式
but后面接动词原形
答
这个就是固定用法 do nothing but (省略了to) do