we must keep quiet in the reading room.(保持原句意思不变)We must keep quiet in the reading room.(保持原句意思不变)We _______ _________ in the reading room.

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we must keep quiet in the reading room.(保持原句意思不变)
We must keep quiet in the reading room.(保持原句意思不变)
We _______ _________ in the reading room.

mustn't talk

can't talk