John hadn’t been able to stop smoking suddenly;he had to control his smoking desire ________.
A．by and byB．sooner or laterC．little by littleD．from time to time
C
by and by 不久以后，不一會兒；sooner or later 遲早；little by little相當于step by step 漸漸地；from time to time 時常地。句意為：約翰不能立即把煙戒掉，他得慢慢地控制煙癮。
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