Question

Hill often attends public lectures at the University of London, chiefly _______ his English.

1. A.
   to improve
2. B.
   improving
3. C.
   to have improved
4. D.
   improved

Answer 1

A
不定式表目的。句意：Hill经常参加伦敦大学的公开课，主要为了提高英语水平。