We must keep our room clean, for dirt and disease go , you know.
A. hand in hand
B. step by step
C. from time ti time
D. one zfter another
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(答案→)A. hand in hand
B. step by step
C. from time ti time
D. one zfter another
解析：句意：我们必须保持室内卫生，你知道脏乱与疾病是分不开的。hand in hand---happenning together and closely connected密切相关的，同时发生的。本句还可说成：Dirt goes hand in hand with disease.