Was it in 1802 when he discovered his hearing problem _____ Beethoven realized that his future ______ in composing music?

A．that; lay

B．when; lay

C．which; laid

D．that; laid

方药配伍体现“以泻代清”特点的方剂是

A.调胃承气汤

B.小承气汤

C.大承气汤

D.凉膈散

E.导赤散