Question

The young soldier really doesn't know ________ to stop the baby from crying hard.

1. A.
   what to do
2. B.
   how to do
3. C.
   when to do
4. D.
   where to do

Answer 1

A
考查疑问代词+动词不定式结构。句意为“这位年轻的战士不知道做些什么，以便孩子不再笑得那么厉害。”故选A。本题易。