what made Bill so angry?_____His girl friend promised to come at 8:30,but she hasn't come yet.
问题描述：
what made Bill so angry?_____His girl friend promised to come at 8:30,but she hasn't come yet.
AHaving kept waiting B.Being kept waitingD,Being kept waited
三者区别.为什么选b
答
首先,根据句意知道逗号前是个从句,对吧?从句的主语是bill,而主句but she hasn't come yet.主语是she,bill是男生.所以是被动句 如果还原从句的话,是bill is kept waiting,但又是放在句首了,is 要变成being ,答案就是这么出来的