Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Some of the tunnels in the cliff are totally natural; some others were carved out by soldiers for defensible purposes.

Suy nghĩ và trả lời câu hỏi trước khi xem đáp án

ADSENSE
ADMICRO
YOMEDIA
ZUNIA9