—Where did you get this book?
—I picked it up from a secondhand bookshop if you ________ know.
| A．must | B．will |
| C．can | D．shall |
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—Where did you get this book?
—I picked it up from a secondhand bookshop if you ________ know.
| A．must | B．will |
| C．can | D．shall |
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