单选题 Computers are already widely used in industry and in universities and the time may come when it ______ possible for ordinary people to use them as well.
A. is B. will be C. must be D. may be

【正确答案】 B
【答案解析】[解析] when在这里是关系副词引导定语从句，修饰time，而不是表示时间的从属连词，所以A不对。must be若表示肯定推断，与possible相矛盾；may be若填入句中，则意思上不准确，故也是错的。