—Can I go to the park, Mum?
—Certainly. But you ______ be back by six o’clock.
A．can B．may C．might D．must
D
考查情態(tài)動(dòng)詞的用法。同意孩子去公園，但是有要求：必須在6點(diǎn)之前回來。must“一定，必須”。
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