问题

Now that the problem ________, appropriate action can be taken, and final success will be seen.
A:is identified
B:was identified
C:has been identified
D:had been identified;
B:was identified
C:has been identified
D:had been identified;
正确答案是:
同类题型
The old man lives ____ but he doesn’t feel ____.
In such a background, his white hair was particularlyhis dark skin.
Robin broke his left leg in the basketball match last week, since then he __________ in bed.
It’s a long time ______ I last saw you.—Yes, and it will be another month ______ we can meet again