Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
She was busy___________a variety of articles to the customers.
A. with introducing
B. introducing
C. for introducing
D. in introducing
Đáp án B
Ta có to be busy doing sth: bận rộn làm gì
Dịch: Cô ấy bận rộn giới thiệu mặt hàng mới với khách hàng.