无论是单机系统，还是网络系统，都会受到病毒的侵扰。
参考答案：对
根据实际情况回答下列问题。
1. What do you do?
2. What do you want to be?
You ______ to town to see the film yesterday. It will be on TV tonight.[ ]
A. needn't go
B. had better not go
C. should not go
D. needn't have gone
