—I remember you were a talented pianist at college.Can you play the piano for me？
—Sorry,I___piano for years
| A．don’t play |
| B．wasn’t playing |
| C．haven’t played |
| D．hadn’t played |
The old man had three sons, all of ____ died during World War Ⅱ.
| A．whose | B．that | C．whom | D．who |
I have bought two pens, ____ write well.
| A．none of which | B．neither of which | C．both of which | D．all of which |
Do you know the reason ____ she has changed her mind?
| A．why | B．which | C．for that | D．of which |
He failed in the exam, ____ proves that he wasn’t working hard enough.
| A．which | B．what | C．it | D．that |
During the week ____ he tried to collect materials for his article.
| A．following | B．followed | C．to follow | D．that followed |