试题题干
Translate the following sentence into Chinese.
What happens when the sky is darkly overcast by clouds and no one can see where the sun is?
参考答案
试题解析
考点：What happens when···当······会怎样；the sky is darkly overcast by clouds乌云密布、天色昏暗。
句子结构：句子为What开头的特殊疑问句，when引导时间状语从句，从句中where引导宾语从句。