Bộ 10 đề ôn thi học sinh giỏi Tiếng anh lớp 9 có đầy đủ đáp án (Đề 7)

The firm has doubled its profits since it its range of products.       A. broadened      B. had broadened       C. was broadening     D. was broadened

20/97

The firm has doubled its profits since it ________ its range of products.

broadened

had broadened

was broadening

was broadened

Giải thích

Đáp án: A