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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.
The Dark Ages in Europe ___________a period which lasted for more than 500 years.
A. that was
B. it was
C. which was
D. was
The Dark Ages in Europe ___________a period which lasted for more than 500 years.
A. that was
B. it was
C. which was
D. was
Phương án D cung cấp động từ chính cho câu .
Đáp án D.