One minute she burst into and the next burst out . We just couldn’t catch her mood at any

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A. crying, laughter
(答案→)B. tears, laughing
C. tears, laughter
D. crying, laughing
解析：句意：她一会哭，一会又笑，我们弄不清楚她此刻的心情。burst into tears突然哭起来； burst out crying突然哭起来；burst out laughing突然笑起来。burst into+名词； burst out+doing，故选B。