本题选D:continually连续地, 频繁地, 持续不断地。
区分“不间断”的英语表达方式:
1.unceasingly 一致地, 调和地
unceasingly
2.gradually逐步地,渐渐地;
3.continuously 连续不断地,接连地;
4.continually
不停地;屡屡地,一再地.
5.continual指“一段时间内多次发生”、“时断时续”或“中断时间很短而又接连发生”, 如:Continual practice is necessary to master English. 要掌握英语必须经常不断地练习。continuous指“连续不断的”, 如:a continuous voyage .
综合以上各点,本题选D.continually
参考资料:http://z.baidu.com/question/19408565.html?si=1