how long has the bookstore been in business ——2000 A when B after_英语解答

how long has the bookstore been in business ——2000 A when B after C since D before

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解答

C
-那家书店开多久了?
-从2000年到现在.
如果补全整句的话,应该是,The bookstore has been in business since 2000.since一般用在现在完成时里,其它几个选项都不合适.