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1 What day was it yesterday?
2 What could Lily do five years ago?
3 What does Mr Black often do now?
4 Where did Mrs Black buy clothes ten years ago?
b
2 What could Lily do five years ago?
a
3 What does Mr Black often do now?
c
4 Where did Mrs Black buy clothes ten years ago?
a
答案：
1.b 2.a 3.c 4.a
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