Oncethehostprogram,thecomputervirusesthenlookfOncethehostprogram,thecomputervirusesthenlookforotherprogramstoinfect.(attach)电脑病毒程序一旦附加到一个主程序上,就会

Question

Once _____________________the host program, the computer viruses then look f
Once _____________________the
host program, the computer viruses then look for other programs to infect.
(attach)
电脑病毒程序一旦附加到一个主程序上,就会开始寻找其他可以进行感染的程序.
为什么答案是attached to/they are attached to

Answer 1

they are attached to这句就是没有省略主加be动词.表示主语被附加.这里电脑病毒与电脑成被动关系,所以用被动语态attached to是因为the computer viruses是主语,所需要的空也是填电脑病毒被怎么了.这里涉及到一个知识...