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：考查连词。题意：虽然到目前为止都是好消息，但是可能有坏消息的日子还在后头呢。while引导从句放在句首，相当于though或although，表示“让步”。选择A项。