ALTHOUGH _________ MORE THAN 40 PRESIDENTS IN THE US OVER THE LAST...

33. - DE THI THU DH 20092010
Tiếng Anh DE THI THU DH 20092010
33. Although _________ more than 40 presidents in the US over the last 200 years, Americans can seldom remember more than 15 at any given time.A. there have been B. there has been C. has been D. have been