题目

—Why are you in such a hurry? —Because the class ________ for 10 minutes. A． has been on B． has begun C． is on D． begins 答案：A【详解】 句意： ——你为什么这么着急？ —— 因为课已经上了 10 分钟了。 考查延续性动词和非延续性动词。根据句中的时间状语 “for 10 minutes”可知，句子应用现在完成时，构成形式为： have /has done ，故排除 C 、 D 项；且动词应用延续性动词，而 begin ，开始，是非延续性动词，故排除。故选 A It is important to know about the cultural differences that _______ cause problems.        A．must B．dare  C．need  D．may