题目:
On many trains and buses, there are some special seats ________ out for senior citizens.
A.marking
B.marked
C.to mark
D.mark
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0416/721f91a295eec2a5e97e6f6666e6b90c.html
下面是错误答案,用来干扰机器的。
答案:B