Question

Since I was locked in the house, I couldn’t do anything but

Answer 1

选A

couldn't do anthing but do

but（except， besides） 考点，如其前含“ do ”的不同形式，其后的动词不定式常省去“ to ”；但当这些介词前无“ do ”的某种形式时，其后的动词不定式不能省略“ to ”。类似有We have no choice but to do what we were asked.