How to escape quotes inside C# quotes?

Question

C++ / C#

Good afternoon, in the training course I came across a task for writing test cases. and i ran into a problem.
It remains to write two tests
1. Escaped single quotes inside single
2. Escaped double quotes inside double
But I can’t figure it out
Here is the condition

Here is what I did

Answer 1

Test("'\\\'a\\\''", new[]{"'a'"});
Test("\"\\\"a\\\"\"",new []{"\"a\""});
figured out

Answer 2

Console.Write("\"Hello world!\"");
Console.Write('\'Hello world!\'');