Question

________ the teacher ________ the students has been to the South Pole．

1. A.
   Both…and
2. B.
   Not only…but also
3. C.
   Neither…nor
4. D.
   /…as well as

Answer 1

D
根据句中的谓语结构，has been是单数形式，与the teacher一致．正确答案是D．