Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Since I _________ a child, I have solved difficult Math puzzles.

• A. A. am
• B. B. was
• C. C. have been
• D. D. had been

Since + QKĐ + HTHT
Dịch nghĩa: Từ khi còn là một đứa trẻ, tôi đã thích giải những bài toán khó.