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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Books are still a cheap way to get knowledge and entertainment, _______?
A. were they
B. aren't they
C. weren't they
D. do they
Books are still a cheap way to get knowledge and entertainment, _______?
A. were they
B. aren't they
C. weren't they
D. do they
Mệnh đề chính khẳng định và có động từ tobe “are” → aren’t they
Đáp án B.