Question

He's given an important talk on the differences between the second language and the foreign language, ________?

1. A.
   hasn't he
2. B.
   doesn't he
3. C.
   isn't he
4. D.
   wasn't he

Answer 1

A
由动词过去分词given可知he's是he has的缩写形式，故附加问句部分应用hasn't。