— Hi, madam. Can I take the story books out?— No, my boy. They ______ be taken out of the reading-room. It's a rule.

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1. (2016·资阳) — Hi, madam. Can I take the story books out?
— No, my boy. They ______ be taken out of the reading-room. It's a rule.

A . mustn't B . needn't C . couldn't D . wouldn't

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