Bytheyear2100,manydifferentmeans
单项选择题 By the year 2100, many different means of transportation（）.
A.will develop
B.will have developed
C.will be developing
D.will have been developed
正确答案：D
答案解析:By引导时间状语要求谓语用完成时。【句子大意】到2100年，将会有许多不同的交通方式发展起来了。
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