单项选择题

Documents______with chemicals will not become yellow with age.

A. treating
B. be treated
C. treats
D. treated
<上一题 目录 下一题>
热门 试题

单项选择题
______he was seriously ill, I wouldn't have told him the truth.
A. If I knew
B. Did I know
C. If I know
D. Had I known
相关试题