44.Since we have a focused subject, we should not talk ___.

44.Since we have a focused subject, weshould not talk ___.

A. at once

B. at hand

C. at intervals

D. at random

【正确答案】 D

【答案解析】 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；at hand在附近，在手头，即将发生；at intervals间或，不时；at random随便，任意。