to cholera, the people became .A. Exposed; terrifiedB. Exposing; terrifiedC. To expose,

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(答案→)A. Exposed; terrified
B. Exposing; terrified
C. To expose, terrifying
D. Exposed; terrifying
解析：考查非谓语。句意：得了霍乱，那些人们感到害怕。根据短语：be exposed to 暴露于，把握关键词to ,所以第一个空填exposed，terrified 感到恐慌的terrifying令人恐慌的，由于主语是人，所以是感到恐慌，所以A正确。