Sincewehaveafocusedsubject，weshouldnottalk_______

Sincewehaveafocusedsubject，weshouldnottalk________.

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。 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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