Question

—I can’t find Mary. Where’s she?
—Sorry, I don’t know ______

1. A.
   where has she been
2. B.
   where she has been
3. C.
   where has she gone
4. D.
   where she has gone

Answer 1

D
宾语从句需用陈诉句语序，故排除答案A和C；has / have been to是指“曾去过…”，has / have gone to是指“已经去…”，本句意思告诉我们，不知道Mary去哪里了，说明她不在，已经去了，故用has gone.所以本题选D。