单项选择题

The bold word "it" refers to which of the fallowing

A．Problem.
B．Material.
C．Difficulty.
D．System.

<上一题目录下一题>

热门试题

填空题

Do you mind ________________ (推迟这次会议到本季度末)

填空题

________________.(如果我是你的话), I would have accepted such an offer given by the manager.