Choose the underline word or phrase that needs correcting in the following sentence.

 It was so a difficult question that no one could answer it.

A. It

B. so

C. it

D. could

Đáp án đúng: B

Cấu trúc với “such”: It + is/was + such + (a/an) + adj + noun + that + …

Sửa: so → such

Dịch nghĩa: Câu hỏi quá khó đến nỗi không ai trả lời được.