问题
选择题
Prices____ all the time and no one knows when they stable.
A．are going up; become
B．have been going up; will become
C．have gone up; will become
D．have been gone up; become
答案
答案：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。