1. --Have you known Dr. Jackson for a long time? --Yes, since she ____ the Chinese Society.
A.has joined B. joins C. had joined D. joined
2. When you get the paper back, pay special attention to what ____.
A.have marked B. have been marked C. had marked D. had been marked
3. As the years passed, many occasions-birthdays, awards, graduations—____ with Dad's flowers.
A.are marked B. were marked C. have marked D. had marked
