====== Рамочные конструкции с предлогом ======

What are you laughing **at**?\\
I know where you have been **to**.\\
The doctor was sent **for**.\\
It was a promotion he would be distressed **about**.

<color brown>**Вопрос**:</color>

Какую функцию выполняет предлог в конце фразы? Можно ли предлог опустить?

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~~DISCUSSION~~