()How long __________ you __________ in the United States?
A: have; study
B: had; studied
C: have; studied
D: had; study
A: have; study
B: had; studied
C: have; studied
D: had; study
举一反三
- ________English? A: How long time are you studying B: How long do you study C: How long have you been studying D: How long time have you studied
- （） hard, I would have gone to college. A: If I studied B: Did I study C: If I have studied D: Had I studied
- My grade on the examination is terrible, I wish I ____ for it more thoroughly. A: have studied B: had studied C: studied D: will study
- If he ( ) the problem well, he couldn't have solved it. A: has not studied B: shouldn't have studied C: had not studied D: were not to study
- If I ______ harder for the final exam, I should have passed it. A: study B: had studied C: studied D: was studying