Question

The students pretended_______ attentively when the teacher came in.

1. A.
   to learn
2. B.
   learning
3. C.
   and learned
4. D.
   to be learning

Answer 1

D
考察不定式的进行时,pretend to be doing,假装正在做什么,句子的意思是学生们在老师进来的时候假装正在认真学习，故选择D