Which sentence has an inappropriate shift in verb tense? • By the time Grandma arrives, Chloe will have cleaned her room. ,• celeb felt calm because he knows the solution to his problem .•. Jasmin will ride her bike after she walks her dog. •. Diego had read for twenty minutes before he played video games

Celeb felt calm because he knows the solution to his problem .

Explanation: This sentence should be written in either of these two ways: "Celeb felt calm because he knew the solution to his problem", or "Celeb feels calm because he knows the solution to his problem."

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

the answer should be b.

explanation:

it should be b because she researched before writing so it would be in past tense. "the author researches her subject before she had written the first draft.