The word "immersed" in the second paragraph means“（）”.

单项选择题22（）

A．reply
B．answer
C．join
D．interrupt

单项选择题Wolfgang’s father told him he couldn’t play the piano yet because（）

A．his sister was taking lessons
B．he had to help his mother
C．he was too small
D．he had to wait for his sister to finish practising