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Don’t all speak at once! ______ , please.

A.Each at one timeB.One by one timeC.One for each timeD.One at a time

D

解析试题分析:解题干句(信息句)的意思是关键。Don't all speak at once !的意思是:不要都同时讲。由此,根据提示句的含义及备选答案,我们可以判断后面的意思应该是:请每次一个。上面四个备选答案中One at a time 的意思是每次一个。at a time是“一次”的意思。所以选D。
考点:考查词组辨析

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