问题

—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: have been trying
C: had tried
D: had been trying
B: have been trying
C: had tried
D: had been trying
正确答案是:
同类题型
–Guess what! Alice has failed in the exam. ____ She is second to none in English in our class.
______ I come to London alone? — Don’t worry, I ______ be meeting you at the airport.
I wanted to buy a storybook butthere were______ left in that bookstore.A.anyone
s good, hard-working and intelligent. _____, I can’t speak too highly of him.