Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.
A. are
B. have
C. were
D. have been
* Đáp án
C
* Hướng dẫn giải
Đáp án C
Bị động trong quá khứ: They were (tobe) often beautifully (adv) illustrated (V-ed)