Since we have a focused subject ，we should not talk _______

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

A、atonce
B、athand
C、atintervals
D、atrandom

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正确答案：

答案解析：

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。atonce立刻;athand在附近，在手头，即将发生;atintervals间或，不时;atrandom随便，任意。

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