I must in be able to succeed together with you

I must in be able to succeed together with you be able to和canI went there in 1984,and that was the only occasion when I ________ the journey in exactly two days.A.must take B.must have madeC.was able to make D.could make must和be able to区别... he will ___speak spanish in two yearsA.may B.must C.can D.be able to i must be to English chu 2I must study hard now in order that I will be able to enter a key high school next year.（保持原句意思）I must study hard now___ ____ ____ be able to enter akey high school next year. be able to和can的区别I went there in 1984,and that was the only occasion when I ________ the journey in exactly two days.A.must take B.must have madeC.was able to make D.could makeC D的区别? I'm afraid Dr.Lin's plane will be a little late,so he ____not able to get here to take part in in the conference on time.A.can B.might C .should D.must they failed to finish the project in time.i regretted______them.A to be not able to help B being not able to help C not being able to helpD not be able to help为什么不是其它选项呢 We must be able to flee the city may be able to must can的区别是什么 We must be able to flee the city our country must be able to keep pace technologically I hope us to be able in the same place.To does not abandon 啥子意思? Am I going to be able to spell that in my notebook. I will not be able to leave hope i will be able to join i hope you_the task in one week.A be able to finish B are able to finish C be able to finishingD are able to finishing 我要的不只是答案,我还要知识点,为什么选这个!