Coral reefs are limestone formations composed of tiny sea organisms and the remains

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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.

Coral reefs(A) are limestone formations(B) composed of tiny sea organisms(C) and the remains.(D)

Coral reefs

limestone formations

tiny sea organisms

the remains

Giải thích

Chọn D

“the remains” -> “their remains”. Nếu dùng là the remains thì trong câu không rõ nghĩa, “their remains” là chỉ “tiny sea organisms’ remains”