— What should we do to prevent the flu?

试题详情及答案解析: — What should we do to prevent the flu?
—We should keep our rooms_____ and the air fresh all the time.
A. cleaning B. cleaned C. clea; 答案：C; 试题分析：句意：――为了阻止流感我们应该做什么？――我们应该一直保持我们的房间干净，空气清新。keep＋宾语＋形容词。结合句意，故选C
考点：考查动词的用法。