1.He was busy writing a story,only once in a while to smoke

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1.He was busy writing a story,only once in a while to smoke a cigarette.
A.to stop B.stopping C.to have stop D.having stopped
2.(Concern) that he has no qualifications in business management,Ken plans to gain the necessary skills by thakinga part-time job.
3.She first went on stage in the 1930s,when the films were silent.
A.a B.the C./ D.an

B.过去进行时,句子中间用逗号隔开,因此是现在分词做状语.此题考察非谓语动词.“ 他忙于写故事,偶尔停下来抽根烟”.stop的逻辑主语是he表示主动关系,不定式在后表示意想不到的结果,分词在后表示伴随情况.因此排除A、C.was writing 与 stop两个动作同时进行,没有明显的先后关系,所以排除D.
Concerning,现在分词做原因状语,Ken是主语.
B.go on the stage是词组,登上舞台的意思.

再问：第一题应该选B，不知道AB有什么区别看了楼下的解释，感觉应该不能用完成时，没有明显动作先后，貌似与进行时无关
再答：你看D，他是完成时的进行式，所以要考虑到动作先后的问题。
再问：个人认为第一题中，吸烟这个动作在说话时间点后，用to do表将来，我选A
再问：好像没有先后么
再问：这个动作不是在说话前的
再答：这里不存在说话时间点，他要表达的的意思是一个过去正在进行的动作。句子中间用逗号隔开，逗号前描述的是他忙于写故事，后面跟现在分词的伴随状态，来进一步描述他很忙。
再问：你的意思是伴随状语么？
再答：对的。不是用不定式表示意想不到的结果，所以不能选A。
再问：还有第二个答案是ed，不是ing
再答：抱歉，这个是我写错了。应该是ed。 Concerned用在句首，表示考虑到，这个就是个考试点，你记住就行了，语法上不好解释。你可以留意下老师上课时怎么解释的。

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