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
本題是關(guān)鍵是理解句子的含義。“我們必須保持屋子干凈，要知道灰塵總是伴隨疾病。（灰塵和疾病總是手拉手。）”故B項(xiàng)符合題意。
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