–Fifty dollars for such a T-shirt! You _____ be joking!

–I’m serious. It’s made of silk.

A. must    B. need     C. may    D. can


A

解析:情景對(duì)話。理解句意,你一定在開(kāi)玩笑。must意為:一定,故選A項(xiàng)。

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