题目内容

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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