44.（ ）

(单选题)（ ） (单选题)______, I have to put it away and focus my attention on stud (单选题)We work during the week, but weekends and evenings are usual (单选题)Never count on him to make any complaint to the manager. He (单选题)The math problem was the most difficult one I had ever met, (单选题)______ private cars are bringing us convenience, they also c (单选题)We’re going to ______ the hutongs of Beijing. Would you like (单选题)Smoking does great harm to our health. ______ is smoking all (单选题)He found ______ a scroll of A Collection of the Poetry of th (单选题)Gogh and Leonardo da Vinci were known ______ their artistic