Dad, daffodil, dahlia, daiquiri, dairy, daisy, dam, dame, damp, dance, danger, dare, dark, dart, data, date, daughter, day, dazzle, deacon, dear, debt, deck, deed, deep, deer, defy, deli, deluxe, demand, den, denial, dent, dentist, deny, deposit, depot, depth, desert, desire, desk, dessert, detail, dial, dice, diet, dime, dine, dish, dock, doll, door, dope, dorm, down, draw, drop, drowse, duck, dugout, dull, dumb, dump, duplex, dust, duty and dynamo are words. They begin with the letter d.
Alliteration
"Can cats catch crafty cockroaches".
Amanda and Anthony are against allowing abortions.
Elderly Elephants Eagerly Eat Eggs
Cat Cannot Control Cam's Camera(:
only does not begin with an a there for there can be no sentence with only starting with an a because only starts with a o.
If intelligently improvised, it is indeed indubitably illustrative. (see the related question)
Fred found frogs for fun.
Keith kissed Kitty knowingly.
Go get Gregory's goat George! Gin gets grandpa going gory.
Adam ate an apple
An Antelope Ate an Apple?