the news so far has been good there may be days ahead when it is bad.A. WhileB. WhenC

问题补充：

the news, so far, has been good, there may be days ahead when it is bad.

A. While

B. When

C. Because

D. If

答案：

(答案→)A. While

B. When

C. Because

D. If

解析：答案：A考查状语从句。句意：尽管到目前为止消息还不错，但是接下来的日子消息也可能变坏。由此可知主从句是让步转折关系，故选A项。