Question

Have you seen my dog?

 I _________ for it and still haven’t found it

1. A.
   looked
2. B.
   was looking
3. C.
   have been looking
4. D.
   had been looking

Answer 1

C
考查时态，句意：你看见我的狗了吗？——我一直在找它，并且还没有找到。结合语境可知前文描述的过去一直在进行并将继续进行下去的动作，故用过去完成进行时态，选C。