Mark the letter A, B, C or D on your answer sheet to indicate the correct answer that best completes each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one
Trả lời câu hỏi dưới đây:
Half of the children were away from school last week because of…………..of influenza.
A. mảnh vụn
B. bước đột phá
C. vụ nổ
D. ổ dịch