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I’m afraid the envelopes must be delivered at once, _____ the conference brochures won’t be mailed.
(A) unless
(B) in case
(C) otherwise
(D) yet
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－－Must we finish our homework now? －－No, you ______. You _______ finish it after school.
A.needn't , mayB.mustn't , mayC.can't , canD.needn't , must
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