Put the verbs in brackets into the correct tense.
1.who ...(use) my toothbrush?
2.What...(you/do) ?
I... (write) a letter.

Ответ:

1. Who used my toothbrush?

2.What do you do?

3. I wrote a letter.

Объяснение:

это past simple,здесь обычное прошедшее время.