Our nervous system has over ten billions nerve cells in a network covering every inch

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

Our nervous system has over ten (A) billions (B) nerve cells in a network covering (C) every inch of our skin and (D) organs

billions

nerve

every inch

organs

Giải thích

Đáp án A
Billions => billion (billions of + danh từ số nhiều / số lượng + billion + danh từ số nhiều)