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        1. —Is Jessica giving us a speech this evening?
          —No, it _________ be her.She _________ to Japan.
          A.mustn’t;has gone B.mustn’t; has been
          C.can’t; has gone D.can’t; has been
          C
          考查情態(tài)動(dòng)詞和時(shí)態(tài)!敖裢斫芪骺▽⒆餮葜v嗎?”“不,不可能是她。她去日本了。”musn’t“禁止,不許”,不能表示推測(cè);can’t“不可能”,表示否定的推測(cè);have gone to“去了某地還沒(méi)回來(lái)”;have been to“去過(guò)某地”。故選C。
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