what have they been doing 是什么时态

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• I_____there in three yearsI_____there in three years.A.went B.have been C.haven't been D.was___lovely cartoon character mickey mouse is!(答案A或B.为什么不是C?)A.what B.how C.what a D.how a
• 麻烦请将英语的几种语法用英文表达出来.例如，have been doing 是属哪种语法分别代表什么意思？
• 第一问：Then man【tried out】 several 【means】 to have those people get across what he said.请问这里的tried out和means分别是什么意思?=第二问：It's obvious that her refusing to see a doctor has ____(led in/resulted in) her illness woresening.请问led in没有导致,造成的意思吗?为什么答案是result in?=第三问：It's nice to see millions who had nothing but 【a record of】 misery and hungry _____（have/to have) the chance to improve their life and livig conditions.①请解释黑框中的a record of应该怎么理解.②请问为何横线处只能用have?我脑子
• What places have they been?怎么翻译?
• they have a good day what are they doing 翻译 英语很弱,they have a good daywhat are they doing翻译英语很弱,并且放血