-----Did you find the missing couple in the mountain yesterday?-------No, but we _ to get in touch with them ever since.A have tried B. had tried C. have been trying D. had been trying
There is such a problem _____ we all should _____.
How long do you believe it will be _____ Chinese people land on the moon?
The position _____ he wants to apply is difficult to get.
I can hardly say which dish is best –it’s simply a(n) _____ of personal taste.
-The accident might not have happened had we been more careful. -But we _____ at that time.