Question

--What's wrong with your uncle, Jack?

--He is ill. A doctor ______.

1. A.
   has to look for
2. B.
   is being operated on
3. C.
   must ask for
4. D.
   has just been sent for

Answer 1

D
此题考查现在完成时的被动语态，由“have/had+been+done”构成。由题意“已派人去请医生了”知，选D项。