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