11. It's the coldest winter they've ever had.
A. They've ever had such a cold winter.
B. They've ever had such cold winter
C. They've never had such cold winter.
D. This is the first time they had such cold winter.
12. It's over ten years since we got married.
A. We got married for over ten years.
C. We were married for over ten years.
B. We have been married for over ten years.
D. We have been married since over ten years.
13. She began to play the piano three years ago.
A. She has played the piano since three years.
B. She has played the piano for three years.
C. She doesn't play the piano now.