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It was not until he took off his dark...

Câu hỏi: Mark the letter A, B, C or Don your answer sheet to indicate the correct answer to each of the following questions.
It was not until he took off his dark glasses____________I realized he was a famous film star.
A. as
B. that
C. though
D. since
Kỹ năng: Ngữ pháp
Giải thích:
Cấu trúc: It was not until + clause that + clause: Mãi đến khi…
Đáp án B.