The bus came after I for about half an hour为什么I后面要填had been waiting?为什么不是had waited?wait不是持续动词吗?

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• The bus came after I for about half an hour为什么I后面要填had been waiting?为什么不是had waited?wait不是持续动词吗?
• It is half an hour's walk from the school to the park.对half an hour's walk画线提问I walk home after school every day.对walk home 画线提问 She sometimes goes to work by bike.同义句
• The bus came sfter I --------- for about half an hourAhad been waited Bhave waited Cwas waiting Dhad been waiting2、Don't disturb me,I-----letters all morning and have written two so farAwrite Bhave written Cwas writing Dhave been writing 3、The building of the lab -----before the end of this termAmust have completed Bmust have been completed Cmust be completed Dmust complete4、What were you doing when I phoned you?