thEy ______ so tirED iF thEy ______ For A wholE DAy.
A．woulDn't FEEl ... DiDn't wAlk
B．woulDn't FEEl ... wErEn't wAlking
C．woulDn't BE FEEling ... wErEn't wAlking
D．woulDn't BE FEEling ... hADn't BEEn wAlking