单项选择题

A．needn’t bother
B．didn’t need to bother
C．needn’t have bothered
D．mustn’t have bothered
<上一题 目录 下一题>
热门 试题

单项选择题
A．for beingB．to beC．on beingD．to have been
A．for being
B．to be
C．on being
D．to have been
填空题
Mankind is growing increasingly interdependent and an International Chemical Society must. extend the benefits of its science to all the people of the world.
相关试题