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(2014·南昌第二中学高三检测)We must keep our room clean,for dirt and di

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(2014·南昌第二中学高三检测)We must keep our room clean,for dirt and disease go________,you know.
A.hand in hand  B.step by step
C.from time to time  D.one after another
A

考查介词短语辨析。句意为:我们必须保持房间清洁,因为脏与疾病是密切相关的。hand in hand连在一起;手拉手,符合句意。step by step逐步地;from time to time有时,不时;one after another一个接一个地。
答案: A