Question

4. Look,so many people are running out of the station. I wonder what      .

   A. is happened   B. was happening

   C. is happening   D. had happened

Answer 1

4. C

句意:看，那么多人正往车站外跑。我想知道正在发生什么事。is happened—般现在时的被动语态；was happening过去进行时；is happening现在进行时；had happened过去完成时。根据句意可知事情正在发生，应该用现在进行时。故答案为C。