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6.which of the following is a run-on sentence?

A.terri had a hard time continuing the tour she was so tired from the day's events.(I PICK A)
B.som students decided to rest,so they returned to their hotel.
C.washington is a great place to visit because there are so many exciting places to

3 answers

Right.
are you sure??
Yes. I taught secondary English for many years.

http://grammar.ccc.commnet.edu/grammar/runons.htm