Abhominaton, abhor, abhorred.
To complete this task we should recollect what is a compound - complex sentence? A Compound - complex sentence is a sentence with two or more independent clauses and at leasr one dependent clause. That`s the rule from the English Grammar. Thus, the correct answer is as follows:
My friend and I went to the beach today, but we were not able to go surfing bacause it started to rain.
