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        1. 4、—Who’s that man under the tree? Is it Mr. Black,our new English teacher?

          —It_______ be. Mr. Black has gone to Shanghai for a holiday.

          A.mustn’t                        B.can’t                     C.needn’t

          4、B

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          —Who’s that man under the tree? Is it Mr. Black,our new English teacher?

          —It_______ be. Mr. Black has gone to Shanghai for a holiday.

          A.mustn’t                        B.can’t                     C.needn’t

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