Unity, c# and former key pressed?

Question

C++ / C#

Hello everyone, how to implement in Unity in c #, so that when you press the A key, for example, if the B key was pressed before, the values ​​​​for example, the character’s speed are reset ? Keyword before? That is, these keys are like antagonists.

if (Input.GetKey(KeyCode.D))// нажата сейчас
        {
            if (Input.GetKey()// не знаю как написать была нажата до этого
                {
                {
                speed=0;
                }

Answer 1

Store in a variable whether the B key was pressed and when. When you press A - check if B has been pressed for a long time. When you press C - reset the variable responsible for the state of B.
Judging by a ton of questions, it’s too early for you to write games, start with something simpler, or go as a junior to the team - they will teach you.