I worked on the problem ____ a long time and I worked it out____ myself____ last..

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• I worked on the problem ____ a long time and I worked it out____ myself____ last..
• I worked on the problem for a long time and I worked it out by myself at las
• 2、专项练习.B:用for,since填空.Shehas been ill ___________more than two weeks.Ihaven't met him _________a long time.Maryhas been here _________8:00 this morning.Wehave been friends _________I was a child.Ithasn’t rained _________two months ago.Ihave lived here _________more than twenty years.Myaunt has worked in this hospital__________1990.Wehave learned 400 words ___________the beginning of this term.Ihave stayed here _____________two weeks.Mrs.Green has been
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