Although I didn’t personally see who was responsible for this mess, but I think I can

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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

Although I didn’t (A) personally see who was responsible (B) for this mess, (C) but I think I can (D) make a guess

personally

for

but I

make

Giải thích

Đáp án : C

Câu đã có “Although” thì không dùng “but”. Although + clause, clause = mặc dù…, …. But = nhưng