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Before you leave the lab, the doors and windows ____shut in case of rain.
A．isB．a(chǎn)reC．is to beD．a(chǎn)re to be
D
考查be to do結(jié)構(gòu)。主語(yǔ)是the doors and windows，謂語(yǔ)要用復(fù)數(shù)，排除A,C；be to do sth.一定要做某事。句意：你離開實(shí)驗(yàn)室前，一定要把門窗關(guān)好，以免下雨。所以選D。
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