Multiple Inheritance and OOps

Please help me to understand the following
public sealed class SqlConnection : DbConnection, ICloneable
{
}
In the above class i have two doubts

1. In C# multiple inheritance is not possible (we can achieve through interface). but here DBconnection is not an Interface then How it is supporting Multiple Inheritance?

2. Iclonable is an Interface . It has a method called object Clone(). But in Sqlconnection Class that method is not implemented . How it is possible?