correct the text by inserting one comma. when meb keflezighi crossed the finish line at the 2014 boston…

correct the text by inserting one comma. when meb keflezighi crossed the finish line at the 2014 boston marathon he became the first american runner to win the race in over thirty years.

correct the text by inserting one comma. when meb keflezighi crossed the finish line at the 2014 boston marathon he became the first american runner to win the race in over thirty years.

Answer

Brief Explanations:

Introductory clauses like "When Meb Keflezighi crossed the finish line at the 2014 Boston Marathon" need a comma before the main - clause.

Answer:

When Meb Keflezighi crossed the finish line at the 2014 Boston Marathon, he became the first American runner to win the race in over thirty years.