He told us that he was tired and thirsty
问题:
He told us that he was tired and thirsty because he ________ in the desert for days.
A.walked
B.has walked
C.had walked
D.would walk
He told us that he was tired and thirsty because he ________ in the desert for days.
A.walked
B.has walked
C.had walked
D.would walk