16. This is the first time I have ever met such a famous person
-> I’ve _____________________________________________________
17. How long is it since they bought the house?
-> When __________________________________________________
18. I have never read such an interesting novel
-> This is __________________________________________________
19. After he had worked hard many years, he retired
-> Before ___________________________________________________
20. When did you collect stamps?
-> How long ________________________________________________
Làm giúp e với ạ, e quên hết công thức l9 luôn rùi🥲 ai có lòng thì ghi công thức với chút xíu cách làm với ạ. Em cảm ơn nhiều nhiều lắm ạa🥺💕
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Sinh Học lớp 12
