单选题 Many businesses' promotion campaigns ______ because they never fulfill what they have said in their ads.
A. pass away B. get by C. fall through D. give away

【正确答案】 C
【答案解析】pass away意为“终止”：get by意为“通过”；fall through意为“失败，成为泡影”；give away意为“放弃，泄漏”。所填之词的主语是promotion campaigns，根据空格后面的never fulfill可知，应该选用fall through。