问题
单项选择题
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
答案
参考答案：B
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。