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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.
We are very happy as we ___________ for this opportunity for more than three years.
A. were waiting
B. have been waiting
C. waited
D. are waiting
We are very happy as we ___________ for this opportunity for more than three years.
A. were waiting
B. have been waiting
C. waited
D. are waiting
... have been waiting... for more than three years.
Đáp án B.