so many representatives_ ,the conference had to be put off

so many representatives_ ,the conference had to be put off Many students being absent,we had to put off the conference. so many students __,the test had to be put off So many people___,the meeting had to be put off.选B many directors__,the boat meeting had to be put off. so many people (being absent),the conference had to be postp many people(being)absent,the meeting had to be put off the flight had to be put off----------the thick fog It____heavily,the outing had to be put off. it ____heavily the outing had to be put off. ; we had to put the meeting off. _____ ； we had to put the meeting off.