单项选择题

According to the passage, when could people start using a maglev commerciaily

A．In 5 years.
B．In 10 years.
C．In 20 years.
D．In more than 20 years.
<上一题 目录 下一题>
热门 试题

单项选择题
The old ______ well looked after by the government.
A．is
B．are
C．being
D．has
单项选择题
The new bridge will ______ the island to the mainland.
A．link
B．unite
C．join
D．combine
相关试题