From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences: One does not normal...

From the words or group of words lettered A to D, choose the word or group of words that best completes each of the following sentences:
One does not normally expect problems but..................come

Answer Details

The correct option is "they do". The sentence is talking about unexpected problems that might arise in the future, so it's referring to multiple problems rather than just one. Therefore, "they do" is the best option since it refers to multiple problems happening.