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

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

admin2013-06-10  56
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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