We all do more speaking ，even when we have a break after class.A. now and thenB. by and

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(答案→)A. now and then
B. by and by
C. step by step
D. more or less
解析：此题考查在特定语境中副词短语的用法。题意为“即使是课后休息的时候，我们也不时地进行更多的口语训练”。by and by意为“渐渐地”；step by step意为“逐步地”；more or less意为“或多或少地”，均不合题意。