单项选择题

I am rather concerned ______ her, for I haven't heard from her since last winter.

A．of
B．at
C．with
D．about
<上一题 目录 下一题>
热门 试题

单项选择题
The heart is an important organ of circulation ______ function is to pump. blood to all parts of the body.
A．which
B．whose
C．of it
D．its
单项选择题
Training astronauts- ______ not an easy thing.
A．are
B．is
C．were
D．be
相关试题