1. “How many pages…………… so far?” a. have you studied b. did you study c. do you …
1. “How many pages…………… so far?” a. have you studied b. did you study c. do you … 1. “How many pages…………… so far?” a. have you studied b. did you study c. do you study d. had you studied 2. We are too late. The plane …………… off ten minutes ago. a. has taken … Đọc tiếp