A vet is a person who has studied to became a doctor 【S1】______ of animals. They take care of the an

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问题      A vet is a person who has studied to became a doctor                             【S1】______
of animals. They take care of the animal’s health. Many pets owners                【S2】______
use vet to help them take care of their pets.                                        【S3】 ______
Some vets take care of dogs, cats, and other small animal.                           【S4】 ______
Other vets take care of large animals such as horses, cows or                       【S5】 ______
large zoo animals. If you have a pet at your house, your pet has                   【S6】 ______
probably seen a vet. Vets can help you to decide                                    【S7】 ______
what kind of foods your animals should eat, what shots your pet                     【S8】______
will need, and how you take care of your animal. It is important to              【S9】 ______
take your pet to see a vet to make sure it stays health.                             【S10】 ______

选项

答案became—become

解析 studied 后应接不定式to become,而不是to became。
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