单项选择题

Before the first non-stop flight made in 1949, it () necessary for all planes to land for refueling.

A．would be
B．has been
C．had been
D．would have been

<上一题 目录 下一题>
热门 试题

单项选择题
He'd rather stay home alone than () in such cold weather.

A．go out
B．to go out
C．going out
D．went out
单项选择题
He says ()but does much.

A．few
B．a little
C．little
D．a few
相关试题