单项选择题

After I _________ for half an hour, I realized that he was not coming.

A．have waited
B．waited
C．had been waiting
D．was waiting
<上一题 目录 下一题>
热门 试题

单项选择题
The meeting is postponed until next week, _________ we won be so busy.
A．since
B．when
C．while
D．that
单项选择题
_________ still young, Mr. George has had amazing achievement in cosmology.
A．When
B．As
C．Although
D．Since
相关试题