play the piano when I was young．

A．didn′t used to      B．wasn′t rise to

C．didn′t use to       D．wasn′t used to

I??? play the piano when I was a young boy.

A. wasn’t used to??????????????????????? B. wasn’t use to?

C. didn’t used to?? ???????????????????? D. didn’t use to

—________  you play the piano for us?

—Sorry, I can't play the piano, but I can sing for you.

A. Can           B. Must           C. May              D. Should