单项选择题

Very few scientists ______ completely new answers to the world's problems.

A．come up with
B．come out
C．come round
D．come up to
<上一题 目录 下一题>
热门 试题

单项选择题
The staff, having finished work for the day, ______ going home now.
A．is
B．are
C．was
D．were
单项选择题
Living in the central Australian desert has its problems, ______ obtaining water is not the least.
A．for which
B．to which
C．of which
D．in which
相关试题