how long___ he ____the storybook from the library a,has ,borrowed b,has,kept c,did ,buy d ,has :bough ___Since last month我希望知道的人,可以帮我一下,说明一下理由

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howlong___he____thestorybookfromthelibrarya,has,borrowedb,has,keptc,did,buyd,has:bough___Sincelastmo

how long___ he ____the storybook from the library a,has ,borrowed b,has,kept c,did ,buy d ,has :bough ___Since last month我希望知道的人,可以帮我一下,说明一下理由
how long___ he ____the storybook from the library a,has ,borrowed b,has,kept c,did ,buy d ,has :bough
___Since last month
我希望知道的人,可以帮我一下,说明一下理由

how long___ he ____the storybook from the library a,has ,borrowed b,has,kept c,did ,buy d ,has :bough ___Since last month我希望知道的人,可以帮我一下,说明一下理由
根据答语,一定是用现在完成时,故排除C ,而BORROW 与 BUY (BOUGHT)是终止性动词,不能与HOW LONG 连用,帮正确答案是B