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We must keep our room clean. Dirt and disease go        , you know.
A.from time to timeB.hand in hand
C.step by stepD.one after another
B
本题是关键是理解句子的含义。“我们必须保持屋子干净,要知道灰尘总是伴随疾病。(灰尘和疾病总是手拉手。)”故B项符合题意。
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