Since we have a focused subject, we should not talk _______. [ A、 ] at once [ B、 ] at random C、 ] at intervals [ D、 ] at hand [

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

A、 ] at once [

B、 ] at random

C、 ] at intervals [

D、 ] at hand [

出自：阿坝师范学院大学英语

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