单项选择题

I was almost asleep last night when I suddenly heard someone（）at the door.

A. be knocking
B. knocking
C. to knock
D. having knocked

<上一题 目录 下一题>
热门 试题

填空题
What does your doctor usually advise you to do when you’re quite sick To ______.
单项选择题
Once more I have to leave Beijing,（）I have been living for eight years.

A. that
B. where
C. which
D. as
相关试题