科研之友
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<正>陈曦和赵晓丹:老师,我们对keep on doing sth.与keep doing sth.的区别不太清楚,我们查阅了许多参考书还搞不太明白,您能详细讲一下吗?Mr. Liu:你们问了一个好问题,下面我们一起看两个句子:Jane kept writing on the paper until the meeting was over.简一直在纸上写,直到会议结束。Miss Huang kept on reading the words and the boy could read them correctly.
