How long have you been here?I _____ here only half a month a

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How long have you been here?I _____ here only half a month ago.A came B have been
C have come
D had been

选A
half a month ago 有具体的时间,用一般过去式
而且come是短暂性动词,所以选A 再问：能顺便解释一下，每个选项的用法之类的吗谢谢
再答： have been 现在完成时，表示去过某地 have come 以前来过 had been 过去完成时，过去的过去，通常用在过去时句中，表示当时之前已经发生的动作

How long have you been here?I _____ here only half a month a How long will you stay here A.two and a half month B.two and Hello,I( )you( ) in shenyang.How long have you been here?A,h —How long have you been here?—For about 10 years,And I _____ how long will you stay here _____ than a month(little) 1.How long have you been here? How long have you been working here? How long have you been here? --How long have you been here?--Only ten minutes.Jim ( )here Hey,I 【】to meet you here .How long have you been here? ----how long have you ----here?----about two mnths.A,been B, Sorry,I'm late.How you been here long No.I ___half an hour a