单选题They were all so tir

问题补充：

单选题Theywereallsotiredthattheycould______.A.do nothing but sleepB.do anything but sleepC.do nothing but to sleepD.do anything but to sleep

答案：

A解析考查固定句式do nothing but do，意思是就干...了；什么也做不了，只能做…，故选A。