填空题

The engineers spent the whole night (work) ______ on the new device.

【参考答案】

working

<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

A．Study math with John.
B．Talk with John about his study.
C．Ask John to be their tutor.
D．Take John to a doctor.