2. 外语
  3. You are supposed (lock) ______ the room before you leave the language lab.

You are supposed (lock) ______ the room before you leave the language lab.

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问题 You are supposed (lock) ______ the room before you leave the language lab.
选项
答案to lock
解析 be supposed to do为不定式用法，意思是“应该”。类似的词语还有be expected to do，be meant to do。
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