Which one of the following sentences is interrogative? A. I passed the entrance examination! B. Be so kind as to feed my dog. C. The canned tuna is in the pantry. D. What will you do when the well goes dry?

The correct answer is D. What will you do when the well goes dry? An interrogative sentence is simply a question, so you'll want to look for a question mark at the end. To remember this, think of an interrogation, in which someone is asked many questions. That way, you can link interrogative sentences with questions.