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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大学英语三级B级

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