问题描述：
-Why do you look so happy?
-As you know.I ___ to london at this time tomorrow.
A will be flying B am going to fly C am to fly D will fly
A B C D选项之间有什么区别 该怎样用.
-As you know.I ___ to london at this time tomorrow.
A will be flying B am going to fly C am to fly D will fly
A B C D选项之间有什么区别 该怎样用.
问题解答：
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