We have often heard her singing & often seen her dancing.
☆ Use the connector 'and(&)' to connect these type of sentences.

Answer: Like the Roman government, the United States has a tripartite system. The U.S. system of checks and balances makes sure that one branch of the government doesn't have too much power. This system is like the veto, which limited the power of Roman consuls.
Explanation:
I think its either b or a mostly a though hope this helps!!
Hey i hope this helps!
A
D
A