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Since we have a focused subject ，we should not talk ________.【单选题】

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Since we have a focused subject ，we should not talk ________.

A. at once

B. at hand

C. at intervals

D. at random

参考答案:

D

译文：既然我们已经有了命题，我们就不应漫无边际地交谈。此题考查对固定短语的掌握情况。 at once 立刻; at hand在附近，在手头，即将发生; at intervals 间或，不时; at random 随便，任意。

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