You are required to(fast)______ the seatbelt when driving so as to protect yours

游客2023-09-22  25

问题 You are required to(fast)______ the seatbelt when driving so as to protect yourself.

选项

答案 fasten

解析 本题考查的是固定结构的用法。“be required to do sth.”是固定结构,此处的to为不定式符号。因此需填形容词fast的动词形式fasten的原形。
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