问题
As we know, you won’t go back to the USA since you have established a research center here．But how long _____ in America? —– For almost
A:did you study
B:have you studied
C:were you studying
D:have you been studying
B:have you studied
C:were you studying
D:have you been studying
正确答案是：
同类题型
The weather in Guangzhou is hotter than_____ in Harbin.
We won’t go shopping if it ________ this afternoon.
Have you finished you work? Yes, I have finished it. I finished it 1 hour ago.
Who’s that girl swimming in the pool? Is it Lucy?－It be Lucy. She is sleeping in her bedroom now.
This toy Mickey Mouse _______be Amy’s. she’s the only kid at the picnic.