Question

Prices____ all the time and no one knows when they         stable.

1. A.
   are going up; become
2. B.
   have been going up; will become
3. C.
   have gone up; will become
4. D.
   have been gone up; become

Answer 1

B
考察时态。根据all the time一直可知第一空应该使用现在完成进行时。第二空是宾语从句，根据句意可知是将来时。句意：物价一直都在上涨。没有人知道什么时候会稳定下来。故B正确。