问题

He was thinking about the problem when an apple fell off the tree, _____ him right on the head.[ ]

A: hit
B:AIDU_
C:/T
D: and hitting

正确答案是：

同类题型

__________ the stars are, the smaller they look, as is known to all the people

The reason _______ he gave at the conference last week for his being carelessness was funny.

Thank you for inviting me to enjoy the magic show.— . Just have fun!

No matter ______, please keep quiet in the library.

I learned about elephants the day before yesterday. There are no bones in the back of their feet.-_______.