he had shut the window, Tom returned to check them carefully. A. Making sure B. To——青夏教育精英家教网—

摘要： he had shut the window, Tom returned to check them carefully. A. Making sure B. To make sure C. Having made sure D. Make sure

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_______ he had shut the window, Tom returned to check them carefully.

A．Making sure B．To make sure

C．Having made sure D．Make sure

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