both____ and_____ laughing do harm to your health.a/ burst into tear ;burst outb/ bursting into tears; bursting out原因

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both____ and_____ laughing do harm to your health.a/ burst into tear ;burst outb/ bursting into tears; bursting out原因

both____ and_____ laughing do harm to your health.a/ burst into tear ;burst outb/ bursting into tears; bursting out原因
both____ and_____ laughing do harm to your health.
a/ burst into tear ;burst out
b/ bursting into tears; bursting out
原因

both____ and_____ laughing do harm to your health.a/ burst into tear ;burst outb/ bursting into tears; bursting out原因
B动名词作主语

B

b 动名词做主语
望采纳