The answer should be " Her only regret was not dancing at the wedding " Because a Gerund is an is a verb that functions as a noun. Wedding is a gerund because the word " Wed " is a verb e.g. " I am going to wed her " so when you add the " ing " it becomes a noun e.g. " I am going to a wedding " That's why the last choice is the best one Hope this helps!
On August 6th the US Air Force dropped an Atomic bomb on the Japanese city of Hiroshima. The city was destroyed and over 70,000 were killed immediately from the effects of the blast. Three days later a second bomb destroyed Nagasaki.
