The light will be thrown ______ the cause of cancer by research that is now in p

题干

The light will be thrown ______ the cause of cancer by research that is now in progress.

A．to

B．upon

C．in

D．for

上一题下一题 0.85难度单项选择更新时间:2010-07-10 04:27:23

小学学科试题库

初中学科试题库

高中学科试题库