______(她刚刚睡着) when a knock at the awakened her.

A．People often ask him to play the songs.
B．Tickets for the concert were rather expensive.
C．The concert will be broadcast on television.
D．He hasn’t been playing the piano lon

A．It is logic.
B．It is off the track.
C．It proposes the main point.
D．It is generally reasonabl