helen is singing in the next room .-It--be helen.she has gone to Beijing.a can not b must not c may

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• can't 和 mustn't.1、-The sports shoes must be Linda's.-No,they ______ be .They're too small for her.2、-Who's the man over there?Is it Mr.Black?-It ____ be him .He's much taller.3、-Listen!Helen is singing in the next room.-It _____ be Helen.She has gone to Bejing.
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