单项选择题

A．when
B．until
C．as
D．while
<上一题 目录 下一题>
热门 试题

填空题
interesting stamps, particularly stamps from the AIth century in good condition, will always be a sound investment
填空题
the speculators moved in, the stamp being sold out on the day it issued and soon changing hands at up to F0 times its face value
相关试题