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

There is estimated that the Orion nebula contains enough matter to form 10,000 stars.

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

ATNETWORK
ADMICRO
YOMEDIA
ZUNIA9