After walking for half an hour, he suddenly realized that he _____ in the wrong direction.
A: was walking
B: has been walking
C: had been walking
D: walked
A: was walking
B: has been walking
C: had been walking
D: walked
举一反三
- I ____________ for about an hour and a half when suddenly I slipped and fell down a riverbank. A: had been walking B: walked C: had walked D: was walking
- He stood up, excused himself, and ________out of the meeting. A: walking B: to walk C: while walking D: walked
- Mary_______in the garden when it began to rain. A: was walking B: walked C: walking D: had walk
- It often takes me half an hour ( ) home. A: walking B: to walk C: walked D: walk
- He _____ to the theater last night. A: are walking B: have walked C: walk D: walked