A-A+
A．They were made by the hackers and put on com
问题详情
A．They were made by the hackers and put on computers.
B．They were not found by the experts.
C．They were prepackaged and found on many computers.
D．They were hard to find.
参考答案
正确答案：C
解析：短文第二段提到The hackers put software on other people's computers…The software just sits and waits until…，由此可知选项C正确。
