问题
选择题
Jim gave up _____ Chinese. He thought it was too hard.
A．learn
B．learning
C．to learn
D．learned
答案
答案：B
考查动词短语。give up, 放弃，接doing形式，故答案为B。
搜题请搜索小程序“爱下问搜题”
Jim gave up _____ Chinese. He thought it was too hard.
A．learn
B．learning
C．to learn
D．learned
答案：B
考查动词短语。give up, 放弃，接doing形式，故答案为B。
计算并填写下表
| IP地址 | 60.147.25.7 |
| 子网掩码 | 255.240.0.0 |
| 地址类别 | ___1___ |
| 网络地址 | ___2___ |
| 直接广播地址 | ___3___ |
| 主机号 | ___4___ |
| 子网内的最后一个可用IP地址 | ___5___ |
3（）