问题描述：
-Could you come back home at three o'clock?
-____.I'll be at a meeting at that time.
A.I think so.
B.Yes,I hope so.
C.I'm afraid not.
D.I'm afraid so.
怎样做?为什么?
-____.I'll be at a meeting at that time.
A.I think so.
B.Yes,I hope so.
C.I'm afraid not.
D.I'm afraid so.
怎样做?为什么?
问题解答：
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