Question

After _______ had happened he could not continue to work there

1. A.
   which
2. B.
   how
3. C.
   what
4. D.
   having

Answer 1

C
考查连接词。从句缺少主语，用what。句意“在发生了那件事后，他不能继续在那里工作了。”故选C。