O(∩_∩)O求助一道英语选择题！！！

来源：百度知道 编辑：UC知道 时间：2024/09/22 11:02:25
Lots of empty bottles were found under the old man's bed.He must have done nothing but_____
A,drink B,to drink C,drinking D,drunk

答案是A啊，为什么呢？？请指教~谢谢！

答案是A
He must have done nothing but drink.
如果前面有do的一切形式（do done doing did does）but 后必须省略to.如果没有则要加to
切记！

这是一个固定结构。must have done ,but do