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Every night before going to bed Mr. Smith goe
问题详情
Every night before going to bed, Mr. Smith goes around the house _______________(以确保所有的门都锁上了).请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：to make sure that all the doors have been locked
to make sure that all the doors have been locked
