问题描述：
句子里的to be doing应该怎样理解?
例:The summer of 1993 was the worst time for college graduate to be looking for a job.
在这个句子里,为什么要用to be looking for ,它与to look for有什么区别,这里能否换成to look for?
例:The summer of 1993 was the worst time for college graduate to be looking for a job.
在这个句子里,为什么要用to be looking for ,它与to look for有什么区别,这里能否换成to look for?
问题解答：
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