摘要： By six o’clock I was too tired to do something else . ( ) A B C D
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—Can I go to the park, Mum?
—Certainly. But you ______ be back by six o’clock.
A. can B. may C. might D. must
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—Can I go to the park, Mum?
—Certainly. But you ______ be back by six o’clock.
—Certainly. But you ______ be back by six o’clock.
| A．can | B．may | C．might | D．must |