Question

John ________ the factory since 1999. He is one of the oldest workers here now.

1. A.
   came to
2. B.
   comes to
3. C.
   has been in
4. D.
   has come to

Answer 1

C
since意为“自从……以来”表示从过去某一时间点到现在的一段时间，谓语动词应用持续性动词。come表示短暂动作，而be可以表示状态，是延续性动词，故答案选C。