第28题: [单项选择]Dr. Bruce will first give you a summary of the situation and then discuss it ______. A. at interval B. at random C. at issue D. at length 参考答案:D 答案解析:at length“详细地”,“最后”,如:speak at(great)1ength;at intervals“不时”,“相隔一定的距离”;at random“胡乱地”,“随便地”;at(in)is