题目内容
—Shall we keep the windows _______ ?
—Sure , so that we can let clear air in . But when we leave the classroom , they must be ______ .
A. opened , closed B. closed , open C. close , opened D. open , closed
D 【解析】句意:-我们把窗户开着好吗? -当然,这样我们可以让空气进来。但是当我们离开教室时,它们必须被关闭。open形容词,开着的;也可作动词,打开。close动词,关闭;closed形容词,关着的。keep+sb./sth.+形容词,其中形容词作宾补。must be+动词的过去分词,被动结构。故选:D。
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