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

游客2024-07-01  9

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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