搜题请搜索小程序“爱下问搜题”
问题 选择题

He watched the children ______soccer yesterday afternoon.    [ ]

A. to play    

B. played    

C. play    

D. playing

答案

C

判断题

凡进口玩具检验合格后都应加施检验检疫标志。()
查看答案
单项选择题

Packet-switching wireless networks are preferable (71) when transmissions are (72) because of the way charges are (73) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (74) for the (75) of time they use the network.

A．charged

B．fined

C．free

D．controlled
查看答案