Prices all the time and no one knows when they stable.A. are going up; becomeB. have been

问题补充：

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：

A. are going up; become

(答案→)B. have been going up; will become

C. have gone up; will become

D. have been gone up; become

解析：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。

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