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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
After he had researched and ____________ his paper, he found some additional material that he should have included.
A. wrote
B. written
C. writing
D. have written
After he had researched and ____________ his paper, he found some additional material that he should have included.
A. wrote
B. written
C. writing
D. have written
Câu sử dụng thì quá khứ hoàn thành với cấu trúc là HAD + P. P
Đáp án B.