【题目】The boy ______ for her in the rain for nearly half an hour before she appeared.
A. waits B. waited C. has waited D. had waited
【答案】D
【解析】句意:在她出现前,那个男孩已经在雨中等了接近半个小时了。因为before后用的是一般过去时,wait这个动作发生在appeared之前,也就是过去的过去,所以空格处应该用过去完成时。故选D。