Which sentence contains an unnecessary shift in tense? a. Hummingbirds are hovering over the geraniums while caterpillars munche
d leaves. b. I finished the fence, but Barbara is still nailing the gate. c. After the glass is heated, the glass blower's job begins. d. I am reading a poem that was written thousands of years ago.
"Broadcasters sold
<span> airtime to sponsors who then used it to run advertisements for their goods and services" is the correct answer. Add sales are a heavy source of profits. </span>
