[A]for[B]up[C]off[D]on
正确答案：A符合道德的劝说行为要有周密的推理，根据搭配，callfor意为“需要”；符合文意。故排除其他选项。callup意为“打电话；使人想起”；calloff意为“取消”；callon意为“呼吁；拜访”。
![[A] for[B] up[C] off[D] on](http://www.mshxw.com/aiimages/29/21266.png "[A] for[B] up[C] off[D] on")
[A]for[B]up[C]off[D]on
正确答案：A上一篇 What is a by－product of burned coal?A. Aluminum, silicon, and magnetic. B. Paving mate
下一篇 Stranger A: Well, it's nice talking to you. Stranger B: ______.
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