—Where did you get this book?—I picked it up fro—Where did you get this book?—I picked it up from a second-hand bookshop if you _____ knowA.must B.will C.can D.shall

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—Where did you get this book?—I picked it up fro
—Where did you get this book?
—I picked it up from a second-hand bookshop if you _____ know
A.must B.will C.can D.shall

D.shall 你从哪里得到这本书的?假如你了解的话,就会知道我是从一家二手书店找到它的