Exposed to the sunlight for a long time, he suffered from skin cancer.

为什么是Exposed 而不是Being exposed?

【答】我的观点是：本句使用Exposed 或Being exposed，都正确。

非谓语动词短语，放在句首作状语，这是常见的语言现象。

1. 如果在句首的是纯粹的形容词短语，由于它不是非谓语动词，这时，应加Being 让其变成非谓语动词。例如：

Being short of money, they can’t start the project at once.

Being ill, Tom couldn’t attend school today.

2. 如果是由分词变来的形容词，加不加Being 均可，因为过去分词本身就是非谓语动词。

例如：

(Being) worried about his health, she couldn’t sleep.

(Being) surprised at the news, he kept asking how.

(Being) exposed to the sunlight for a long time, he suffered from skin cancer.

归纳总结如下：

如果是由过去分词变来的形容词，加不加Being均可；如果是纯粹形容词，就加Being。