--- Look! It ____ be Jack on the playground.
---It ____ be him. Because I saw him enter the school library just now.
A. may; mustn’t           B. must; can’t        C. can; can’t  
B

試題分析：句意：看操場(chǎng)上肯定是杰克，那不可能是他，我剛才見(jiàn)到他進(jìn)入了學(xué)校圖書(shū)館。must,can(could),may(maight) 可以表示猜測(cè)，must 表示肯定猜測(cè)，用于肯定句，肯定……，一定……；can’t,表示否定猜測(cè)，肯定不……，另外can(could),may(maight)，表示可能性猜測(cè)，可能……。根據(jù)句意，故選B
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