Question

--- What are you doing?

--- I’m        life in the countryside.

1. A.
   think over
2. B.
   thinking over
3. C.
   think about
4. D.
   thinking about

Answer 1

D
think over为动副结构，侧重于思考，不涉及结果，表达“深思熟虑，仔细思考”之意；  think about，表示“考虑”特别是考虑某一计划是否可行，后接一个名词、动名词或带疑问词的不定式。根据语境可知选择D,用现在进行时。