Đáp án B
Kiến thức về phó từ, thì
A. then /θəen/ (adv): sau đó, lúc đó
B. ago /ə’gəʊ/ (adv): trước đây, về trước
C. early /’ə:li/ (adv): sớm; đầu
D. back /bæk/ (adv): ở phía sau; lùi lại
Giải thích: A hundred years ago, teachers were stricter than today.
(Một trăm năm trước, giáo viên từng nghiêm khắc hơn ngày nay.)
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