题目内容

W: Ray, aren’t you going straight home after school today?
M:___________

A. Yes, I won't be going home until Friday.
B. No. I have a class until one o’clock, and after that I'm going to spend a couple of hours at the library before going home.
C. Yes. But I am afraid I have to stay for a few hours in the city library before going home, home directly.
D. Yes. If I were you, I wouldn' t go

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已知文法G(S)为:
S→aAcBd
A→bA|e
B→d

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