【题目】The speaker told a joke or story ________when he gave the talk to keep us interested.
A. here and there B. sooner or later
C. more or less D. now and then
在线课程【答案】D
【解析】
考查词组。句意：当演讲者发表演讲让我们感兴趣的时候，他不时地讲一个笑话或故事。A. here and there到处；B. sooner or later迟早；C. more or less 或多或少；D. now and then偶尔，有时。故选D。