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Answered

The following sentence contains _____.


The Mason-Dixon line, which is perhaps the most famous border ever established by surveying methods, has been designated a National Historic Landmark.


One main clause

Two main clauses

One main and one subordinate clause

One main and two subordinate clauses

Verified Answer :

) The first three words of the main clause are: The, Mason-Dixon and line. 
b) The first three words of the subordinate clause are: which, is and perhaps. 
c) The subordinate clause functions as a dependent clause. It gives information related to the main clause and cannot exist alone.