They have been singing for half an hour.
A: SV
B: SVO
C: SVC
A: SV
B: SVO
C: SVC
举一反三
- How long has she been there(). A: An hour. B: An hour and a half. C: Half an hour.
- The cat caught a mouse. A: SVO B: SVOO C: SVC D: SV
- The bus came after I _____ for about half an hour. A: had been waiting B: have been waiting C: have waited D: was waiting
- We half an hour for the bus, but it has not come yet. A: have waited B: are waiting C: had been waiting D: have been waiting
- What has Tom already done A: He arrived here three hours ago. B: He’s been here for half an hour. C: He came here half an hour ago.