It is absolutely necessary for us to have sufficient oxygen if we （）to go on living
A: are
B: were
C: had
D: having
A: are
B: were
C: had
D: having
举一反三
- a car when you were living in Paris? A: Had you B: Were you having C: Did you have D: Have you had
- The light went out while we(__)supper. A: had B: had had C: were having D: would have
- Were it not for the expense involved, we ______ there by plane. A: would have been B: would go C: had been D: had gone
- They _____ to see us more often when we were living in Shanghai. A: have been coming B: have come C: came D: would be coming
- Mr. Smith can't go with us, because he ________a meeting. A: A. was having B: B. would have C: C. is having D: D. had