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    Before you leave the lab, the doors and windows ____shut in case of rain.
    A．isB．areC．is to beD．are to be
    D
    考查be to do结构。主语是the doors and windows，谓语要用复数，排除A,C；be to do sth.一定要做某事。句意：你离开实验室前，一定要把门窗关好，以免下雨。所以选D。
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