have a duty to do还是have duty to do

have a duty to do还是have duty to do have a good time doing还是to do?have fun doing还是to do I feel I must____my duty as a teacher to teach children_____to study.A.do,how B.have,what C.be on ,what请说明原因. 有机会做某事,have a chance to do 还是have the chance to do 啊 have a wonderful time+doing还是to do have a good time 接to do 还是on Let every man ( ) his duty.A.to do B.does C.doing D.do have enough time to do还是do Do you know ____ else is going to be duty today?whom?还是who 急 we have the duty to...请问这个the有必要改为a吗?we have the duty to...请问这个the有必要改为a吗? it is our duty to do Have a good time 后加do还是to-do 还是doing duty report 什么意思?解释下：it's one's duty to do sth.have an influence on sth.be lost lose one's heart i have a lot of woke to do.其中的to do是宾补还是定语后置? have a difficult time to do sth.还是have a difficult time doing sth. have a good time (to do) sth 还是 have a good time （doing) sth have a wonderful time后面+ to do 还是 doing I have a wonderful time ________ (chat). have a chance to do还是have a chance of doing