What led film pianists to take care in matching their pieces to the mood of the film().

A.The special relationship between the music and the films.

B.The great interest of the audience.

C.The apparent mis-match between the music and the films.

D.The decline in box-office value for silent films.

—I don’t suppose they could have finished their experiment,      they?

—       , they are still doing it in the lab.

A．could; Yes

B．didn’t; No

C．have; No

D．couldn’t; Yes