单项选择题


A．be
B．is
C．been
<上一题 目录 下一题>
热门 试题

单项选择题
______ the help of his teacher, he made a great progress.
A．Under
B．With
C．By
单项选择题
If Mark Twain couldn't find his ticket, ______.
A．he had to buy another one
B．he had to get off the train
C．he couldn't know where he was going
相关试题