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        1. —Look at the boy running on the ground. Is it Davis?
          —It ______ be him. I saw him go to the teacher’s office just now.
          A.mustn’tB.can’tC.couldD.might
          B

          試題分析:句意:—看那個在地上跑的男孩,他是David嗎?—他一定不是David,我剛才看到他去老師的辦公室了。此空表示否定推測“一定不是”,應用can’t,mustn’t是不準的意思,故選B。
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