37. The plane’s departure was delayed because of mechanical difficulties. When the weary
passengers finally boarded the aircraft, many were annoyed and irritable because they in
the airport for three and a half hours.
A. Are waiting B. were waiting C. have been waiting D. had been waiting
Bạn đang xem 37. - BAI TAP TRAC NGHIEM VE CAC THI TRONG TIENG ANH