— It's very important for you to arrive on time.— I ____ be there at seven o'clock,I promise.A.will B.can C.must D.should 选A为什么,为什么不选C

— It's very important for you to arrive on time.— I ____ be there at seven o'clock,I promise.
A.will B.can C.must D.should
选A为什么,为什么不选C

这个题要结合语境,回答中有I promise,表示是主观上的,must有不得不的意思,客观上的