【单选题】Mark was a student at this university from 1999 to 2003, _______ , he studied very hard and was made Chairman of the Students' Union. A. during which time B. for which time C. during whose time D. by ...
【单选题】During the voyage he encountered boisterous winds and heavy weather during which time the vessel________ heavily and to such an extent that at times it was necessary to change course.
【单选题】During the voyage the ship encountered ______ winds and weather,during which time she labored heavily and to such extent that at times it was necessary to change courses and reduce speeds in order to ...