---What made Susan so angry?---______ in the rain for a long time．A.Being kept waitingB.Being kept to waitC.Because of waitingD.She was kept waiting
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A解析这是一个省略的答语，空格所在部分为句子的主语，故需用动名词形式；这儿还考查了keep sb/sth doing结构的被动语态形式be kept doing。答语的意思是“让她在雨中等了半个小时使得她很生气”。